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Fusion 12 Big Sur - Unable to create installation medium

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I am unable to create a Big Sur VM in Fusion 12 using the macOS 11.0.1 installer.

Any suggestions? Fusion is up to date.

For our testing purposes, I am not looking to upgrade a Catalina VM to Big Sur. That has been tested already.

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No solution yet, apparently VMWare is aware, so I imagine we'll see a fix soon.

In the meantime I'm exploring this:


https://github.com/rtrouton/create_macos_vm_install_dmg

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I was able to get one setup by creating an iso with the installer..run the following: 

hdiutil create -o /tmp/BigSur -size 17000m -volname BigSur -layout SPUD -fs HFS+J
hdiutil attach /tmp/BigSur.dmg -noverify -mountpoint /Volumes/BigSur
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/BigSur --nointeraction
hdiutil detach /volumes/Install\ macOS\ Big\ Sur (this didn't work for me but was able to force eject with finder.) 
hdiutil convert /tmp/BigSur.dmg -format UDTO -o ~/Desktop/BigSur.cdr
mv ~/Desktop/BigSur.cdr ~/Desktop/BigSur.iso


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I had exactly the same problem. Do you have any update yet?

 

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same issue

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No solution yet, apparently VMWare is aware, so I imagine we'll see a fix soon.

In the meantime I'm exploring this:


https://github.com/rtrouton/create_macos_vm_install_dmg

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Already tried. No luck. Please let me know how it goes.

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I was able to get one setup by creating an iso with the installer..run the following: 

hdiutil create -o /tmp/BigSur -size 17000m -volname BigSur -layout SPUD -fs HFS+J
hdiutil attach /tmp/BigSur.dmg -noverify -mountpoint /Volumes/BigSur
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/BigSur --nointeraction
hdiutil detach /volumes/Install\ macOS\ Big\ Sur (this didn't work for me but was able to force eject with finder.) 
hdiutil convert /tmp/BigSur.dmg -format UDTO -o ~/Desktop/BigSur.cdr
mv ~/Desktop/BigSur.cdr ~/Desktop/BigSur.iso


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I can create an iso file but it's not bootable. Is your iso file bootable?

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Oh yeah, it worked. Thanks mate.

Enthusiast
Enthusiast

I have the same error.

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You can follow instructions given by taylorcurtis805. Then create a custom vm and load the iso file via CD/DVD.

Contributor
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Same issue with VMWare Fusion 12 and macOS Big Sur 11.0.1

 

https://github.com/rtrouton/create_macos_vm_install_dmg - this works.

Enthusiast
Enthusiast

Thanks Karthik.  That worked perfectly for me

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create_macos_vm_install_dmg.sh (from https://github.com/rtrouton/create_macos_vm_install_dmg)  created two files:
+ macOS_1101_installer.dmg
+ macOS_1101_installer.iso

I used macOS_1101_installer.dmg with VMWare Fusion 12 Pro and I'm able to install macOS Big Sur (11.0.1)

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Thank you all for the contributions made here! Friendly tip - be sure to exclude the host system creating the installer from any Big Sur software restriction in your MDM.

The scripts posted above led to a "Kill 9" error - which was Jamf in our case killing the installer process during the createinstallmedia function.

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@taylorcurtis805 I was able to fix the force eject with adding -force to that line:

hdiutil detach /volumes/Install\ macOS\ Big\ Sur -force

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