Dmg Keeps Mounting After Installation

  1. If you're a Windows switcher, a.dmg is the same thing as an.iso file basically. It's a disk image. Mac appears to like to use image files for programs downloaded through the internet, while Windows usually use.zip files or direct.exe files. So I would say treat those.dmg files as you would.zip files in Windows.
  2. DMG files can be easily accessed with the help of Mac but the main challenge is to open Mac.dmg in windows as sometimes at workplace there is a need to mount DMG in Windows. Need to Mount DMG in Windows. DMG files are Mac OSX Disk Image files. As they are Mac installation files and the users cannot install these programs on Windows. So, to read a Mac DMG file in Windows we have to download Windows version of the program with the.exe file extension. Without Windows, we cannot go through the.

Sep 11, 2019 I have an iMac A1224, stock HDD is broken. My DVD-rom seems not to be working as well. So I tried saving an image (dmg) using Transmac on windows. I was able to install the OS, but after restart, I always get stuck after the apple logo displays.

A new macOS release is nearing release, and it's a big one. So big that this time it's really, completely and definitely not OS X any longer. With the death of Kexts looming and the transition away from Intel CPUs spelling disaster for Hackintoshers and multi-OS users alike, it's certainly an interesting time.

Oh, and rounded edges. So many rounded edges. Good golly.

Update 2020-11-13: For the specific steps required to get the Big Sur public release to work, I made a companion post that you can find right here.
Update 2020-11-11: This guide has been updated to support Big Sur 11.0.1 Release Candidate 2 (Beta 3).

Today I'd like to walk you through how to get Big Sur installed and up and running in a virtual machine on your Ubuntu or similar host machine. In this article I'll focus on steps and commands that are tailored towards Ubuntu 20.04, but I'm sure you'll be able to tweak things a bit to tailor towards whatever flavor you're running to get things to work similarly.

Let's get to it.

As of this writing, Big Sur 11.0.1 Release Candidate 2 (Beta 3) is the recent-most beta release. While the guide should remain useful for all subsequent releases as-well as the eventual full release, the fetch-macOS script might need updating for future beta releases and the eventual full release. Please check the relevant repositories for up-to-date information on this.

In this guide I'll assume you have already set up your host machine, including having set up QEMU, virt-manager, etc. As mentioned before, I'm focussing this guide on running Ubuntu 20.04 as the host OS.

No physical Mac needed

You do not need a physical Mac to download anything necessary to create this VM. We'll be using a few tools to fetch and extract the installer files needed right from your host machine.


Be sure to have Python installed. In my case I already had Python installed but I needed to install an extra package called python-is-python2 to get certain tools to work, but you might also want to make sure python2 is actually installed.

Build tools

We'll be building a few tools from source, so we'll need build tools installed for that. To be honest I already had most of these installed, so I am probably going to miss one or two in this list. If one of the build steps later on this guide fails, it'll tell you what's missing so you can install it at that point. Please let me know if I did actually miss anything here.

Other utilities

Also be sure to install these tools if you don't have them already:

What's happening: We'll need dmg2img to convert an image file, and while 7zip is optional, it's a great compression and decompression tool that I highly recommend you keep around as it's super convenient.

Both literally and figuratively. Most of the work has been done by the amazing people who have created and keep this repository up-to-date. There's a few minor tweaks we'll make to get Beta 3 to work, which at the time of this writing isn't yet working out of the box when relying on the original repo (I have submitted a PR for this). Hopefully this'll get added soon, but for now you can head over to my fork where I've already applied the fix needed to get Beta 3 to download. The main repo has since been updated and should automatically fetch the recent-most beta.

Go ahead and download the repo to your local machine.

Open up a Terminal and from the OSX-KVM repo you have just downloaded, and run:

You should see a bunch of things fly by and the tool will start downloading a relatively humongous InstallAssistant.pkg file, clocking in at 12GB.

Note: If you have issues at this step, it is possible an incomplete plist file has been downloaded, or perhaps a complete but now out-of-date version. The tool keeps using an already downloaded file if it exists, so if you get a warning about something related to XML parsing or you're not getting the version you expect, try deleting the files found in content/catalogs/other and running the tool again.

While this is downloading, let's set up a few additional things we'll need once the download is done.

Download & build XAR

Download the XAR repository here, and open another Terminal window/tab and head over to where you have downloaded this repository. Inside, run the following:

What's happening: We head into the xar sub-directory, run autogen.sh to generate the configure script, and then build the project with make. We're not installing the tool, so the results stay contained within this folder.

Download & build darling-dmg

Download the darling-dmg repository from here, and head on over to this directory in a Terminal window. Darling-dmg is a part of Darling, a sort of WINE for macOS software, which I didn't even know was a thing that existed until I was going through this process. Regardless, we don't need the entire Darling project, so that's why we're just pulling in darling-dmg.

If you already have Darling installed on your system, you can skip this step as you should already have darling-dmg available.

From the darling-dmg repository folder, run the following:

What's happening: We're just configuring and building darling-dmg here. We're not installing it, so the results stay contained within this folder. If the build fails, please check the results as this is probably due to a missing library. Simply look through the messages to find the library you're missing, apt install it, and try again.

By this point the download has hopefully finished, and you should have InstallAssistant.pkg sitting right there in your OSX-KVM folder. We'll have to take a few steps now to get to the actual installer image file, so let's do that now.

Make note where the XAR and darling-dmg folders are relative to your OSX-KVM folder, as we'll have to use these now.

Step 1: Extract InstallAssistant.pkg

Let's create a folder in which we'll extract all files to, to keep the repo from getting messy:

In a Terminal window opened to your OSX-KVM folder, let's now extract the PKG file:

What's happening: We're using the xar tool we build just before to extract the file by pointing to it relative to your OSX-KVM folder. The built tool should be at xar/src/xar within the folder where you have checked out the XAR repository. -x tells the tool you want to extract, and with -f filename you specify which file you want to extract from. Lastly, -C ./extracted tells it to extract the files to the specified folder we have created just previously.

After a bit, a few new files should have shown up inside the extracted folder, including SharedSupport.dmg.

Step 2: Mount SharedSupport.dmg

Now we'll use darwin-dmg to mount SharedSupport.dmg. In Terminal, run:

What's happening: We're creating a folder called tmp, which we'll use to mount the disk image to. We then use darling-dmg by referencing it from the folder we checked out its repository to, and specify we want to mount SharedSupport.dmg to the just-created tmp folder.

If this went well, you should see a few messages in your Terminal, and a newly mounted drive show up in your file manager called tmp. If you want to stick to using Terminal, you should also see these files when cd'ing into it; cd tmp && ls -la.

Step 3: Extract BaseSystem.dmg

With SharedSupport.dmg mounted, we need to extract BaseSystem.dmg, which is located inside a ZIP file. Using 7zip, run this from your OSX-KVM directory:

What's happening: We're extracting BaseSystem.dmg from a ZIP file found inside the SharedSupport.dmg image we have just before mounted to ./tmp. The ZIP file is located inside the com_apple_MobileAsset_MacSoftwareUpdate sub-directory, and BaseSystem.dmg is located in AssetData/Restore within that ZIP file. If you like, you can use your favorite file manager and archive tool to extract this directly too. The -o./extracted flag lets 7zip extract to the 'extracted' folder we have just before created, to keep our repository directory nice and clean.

Step 4: Convert BaseSystem.dmg

We'll now use the dmg2img tool to, as the name implies, convert the image to the img format, something that QEMU can actually work with. Simply run:

A moment or two later you should have the macOS Big Sur installation disk image ready to go. Exciting!

We're now done with both DMG files, so let's unmount SharedSupport.dmg and remove the tmp dir. You can now also delete both files if you like:

The OSX-KVM repository comes with a convenient shell script that you can use to easily launch the VM directly. This file has everything you need pre-configured, though the defaults are probably not ideal if you're planning to use this VM for anything more than just gazing upon it once or so. For example, only 3GB RAM is allocated to it, which is a tiny amount of course.

If you're just curious, or if you want to use this script to sort of jump-start the installation of macOS after which you'll move the disk image with Big Sur installed on it over to a more permanent VM configuration, this might be a handy starting point. Otherwise, you might want to skip ahead to the section on using virt-manager.

Method 1: For quick testing, momentary curiosity, or for use as a starting point

The script is called OpenCore-Boot.sh and assumes you're launching it from within the repo's directory, have BaseSystem.img ready to go, have a hard drive disk image created, and have the 'default' network adapter all set up and ready to go. We're two for four here, so let's go ahead and tackle those last two bits. First, let's create a disk image we'll install Big Sur onto:

What's happening: We're using the qemu-img tool to create a new disk image called mac_hdd_ng.img that's 128GB in size. Be sure to customize the size to your liking, in case you need more (or less) space.
Note: If you get a message saying you don't have qemu-img installed, you probably didn't install qemu-utils.

Next, let's set up some basic networking so this VM can actually boot up:

What's happening: We're basically setting up and configuring a bridge network connection which VMs can use to connect to the internet. For anything beyond quick testing you'll probably want to set up a more robust configuration or pass through an actual network adapter if you have multiple, but for now this should at least get you going.

Lastly, as we kept all prepared files in a subdirectory, we should modify the OpenCore-Boot.sh script to point to the right directory. While we're in there, we might as-well update the RAM allocation, unless 3GB is enough for your specific needs of course.

You can find the reference to $REPO_PATH/BaseSystem.img on line :52. Simply update it to read $REPO_PATH/extracted/BaseSystem.img and that should be it. If you have created the qemu hard drive image someplace else or used a different name, you can update that reference on line :53. Lastly, the amount of RAM the VM will use is specified on line :21 in the ALLOCATED_RAM variable. 8192 (8GiB) might be a good choice, or 16384 (16GiB) if you can spare it and are planning to do Mac/iOS development for example.

Now you should be able to boot up the VM for the first time! To start it, just run OpenCore-Boot.sh from a Terminal window, and a QEMU remote viewer screen should show up soon thereafter.

After a brief moment, a familiar screen will show up with a few options. Simply hit enter to boot the first option (called macOS Base System), which is the installation disk image.

Note: The OpenCore configuration included with this repository has verbose mode enabled, so you'll be seeing a lot of messages run by as the system (and the installer) boot up. This is normal and intended. You'll be able to modify the OpenCore configuration file to disable this should you want to, but that's outside the scope of this already rather lengthy article :).

From here you can proceed as you normally would. Before you start with the installation, be sure to launch into Disk Utility the first time so you can format the disk image.

After selecting and launching Disk Utility from the main menu, select Show All Devices from the sidebar options menu. Then, with the correct disk image selected (you can double check the capacity to make sure you're looking at the right drive), click Erase, name your drive and select your preferred options (Encrypted or not, Case-sensitive or not), and click Erase.

Dmg keeps mounting after installation tool

Note that in my case I was not able to actually start the Big Sur Beta installation on a drive that I formatted using the APFS Encrypted option. I am not sure if it was a limitation of the specific beta I was installing or something else. If you run into the same issue, try re-formatting the drive to non-Encrypted APFS. Your root drive should already be encrypted so it's probably not the end of the world, and I'm sure the non-beta version will certainly support encrypted drives again.

When you're done with that, click Done, close Disk Utility, and select Reinstall macOS from the main menu. From there you can follow the steps as you normally would.

Note: As you probably know, at one point during installation the VM will reboot. To let it continue with the installation, at the boot selection screen be sure to select the macOS Install option, as that's the as-of-yet incomplete installation of macOS on the hard drive.

After about an hour or so of you should be greeted with the welcome stuff, where you can set up your user account and whatnot. And after that, well, get ready for border radii to dazzle you with their roundedness.

At this point you should have a working macOS Big Sur VM. Congrats! But it might not be the most elegant of setups. You'll have to use OpenCore-Boot.sh to launch the VM every time, and you'll probably notice that macOS itself feels rather sluggish too. The latter is due to the lack of any form of hardware acceleration, something you can only really fix by passing through a graphics card. That topic and several more might be interesting as a follow-up articles, so if you'd like to see that, please let me know.

I hope this was useful for you and that this guide has helped you get to a working virtual machine. Enjoy, and happy coding!

Thank you.

A .DMG file is a container file commonly used to distribute applications for Mac OS X. Installing software from one of these requires you to mount the image and move its contents to your computer’s “Applications” directory.

One of the most common mistakes I see among new Mac users is fumbling with how to install and open .dmg files or new software. The process for installing new applications on your Mac can be confusing at first because it differs greatly from Windows’ software installation process. Nevertheless, the Mac method of installing software is actually quite simple and intuitive once you are accustomed to it. If your desktop is littered with DMG files and white “drive”-looking icons, read on!


What are .DMG Files?

DMG stands for Disk Image, and is a format commonly used to distribute files and applications among Apple computers. A DMG file is like a virtual DVD or hard drive. They can be “mounted” on your Mac in order to work with their contents, or even burned to an actual physical disc.

In order to understand the concept of a DMG disk image, think of a storage volume such as a CD, DVD, hard drive, or external drive. A DMG file is like one of these devices in that it serves as a means to encapsulate documents, images, software, and other files. The difference is that with a DMG, there is no physical storage medium. There is only the DMG file, which can be written to a hard drive, burned to a CD or DVD, or sent over the Internet.

In order to work with the contents of a DMG file, you must mount the the disk image to your system. This may sound daunting, however “mounting” a DMG file with Mac OS X is no more complicated than double-clicking it’ icon. The operating system will load the load image and place a new icon both on your desktop, and in the sidebar of the Finder. The icon will have the same name as the DMG, and you’ll be able to browse through its contents like any other folder.

Once you are done working with the contents of the file, you will want to remove or “unmount” it from your system. Do this by opening the Finder and clicking the eject icon next to the virtual drive’s icon. Or, go to the Desktop, click once on the icon, and press CMD+E.

Dmg Keeps Mounting After Installation Contractors

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How to Install and Open .dmg Files on a Mac

Software installation with Mac OS X is very different than in the Windows world. On a Windows PC you run an installer, tick off a few checkboxes, and wait for the progress meter to reach completion. There usually is no such “installation wizard” on a Mac &emdash; you simply drag and drop the program into your computer’s “Applications” directory. The trick is that most Mac applications are distributed as images called DMG files, and many new Mac users end up running applications directly from the image instead of installing them to the “Applications” directory.

Enough explanation, here’s how to install an OS X app from a DMG file:

  1. Find the downloaded file, which usually ends up in your Desktop or Downloads folder.
  2. Double-click the .DMG file to mount it. A new Finder window showing its contents should appear.
  3. If the window also contains a shortcut icon to “Applications”, drag and drop the app onto the shortcut.
  4. If not, double-click the mounted volume on your desktop and drag the app icon from there to the “Applications” icon in the Finder sidebar.

Further Explanation

Alright, that was the abridged version. Here’s the long version. I’ve just downloaded the DeskLickr application, and the DeskLickr_1.2.dmg is sitting on my desktop. I double-click it and a new icon labeled “DeskLickr 1.2” appears on my desktop. Here’s what my desktop looks like at this point:

Since most of the time a new Finder window also pops up when the image is ready for use, this one is now sitting on my desktop:

Different applications are going to show you slightly different Finder windows. Each application’s designers like to add their own artwork. Glitter aside, most applications are trying to tell you the same thing. See the arrow pointing from the DeskLickr icon to the “Applications’ shortcut? It’s telling you to drag and drop the icon into that folder. Once you’ve done so, the app will be installed.

If a program doesn’t provide a shortcut to the Applications folder, you’ll need to pop open a new Finder window. Press CMD+N to open a new window, then drag the program over to “Applications” in the left-hand side of the window.

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House Cleaning

Once the new program is installed it’s time to do some house cleaning. You no longer need the disk image you downloaded, so follow these steps:

  1. Close any Finder windows that have been left open.
  2. Eject the disk image (not the .DMG file). Click on its desktop icon, then press CMD+E.
  3. Delete the .DMG file by dragging it to the trash.

That’s it! Your new Mac application is ready to use. But wait…

Dmg Keeps Mounting After Installation Windows

Bonus Tip: Add Your New Application to the Dock

Dmg Keeps Mounting After Installation Contractors

I knew you were going to ask, so I figured I would cut you off at the pass. Rig manager for macos. In order to add the new application to the dock, follow these steps:

Dmg Keeps Mounting After Installation Kit

  1. Open up a new Finder window.
  2. Click on “Applications”.
  3. Locate your new program’s icon.
  4. Drag the icon to your Dock, and drop it wherever you like.

Dmg Keeps Mounting After Installation Instructions

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