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I have my main internet accessible server running in Parallels Desktop running macOS 11.2 as I used the App Store installer for that version.
There is a serious security fault with sudo that can escalate an unprivileged user to superuser (root) access and that is fixed in the macOS 11.2.1 update.
There is no way for me to update my internet accessible virtual server since the App Store Installer contains version 11.2 with the vulnerability, and I cannot get the 11.2.1 update in the virtual machine.
This is SERIOUS!
Don't know if it's a Parallels issue or an Apple one.
Thanks for the suggestion but unfortunately at this time of typing the App Store macOS Big Sur installer is still version 11.2 from a week ago which means it still has the sudo vulnerability. It does look like there will likely be a 11.2.1 release at some point.Go to your VM and open up the App Store. Search for Big Sur. 11.2.1 should be available, and you can try to download it that way.
Shut down the VM and add
devices.smbios.board_id="default"
to the hardware boot order advanced settings: this fixed the problem for me (after booting the VM again, the update was available in Software Update)...
That seemed promising but sadly did not work. I checked with the guest's System Profiler and with those lines added in the boot settings the guest identified itself correctly, but still didn't update. Interestingly my Mac mini Server 2012 also runs Catalina and my hopes were to run the virtual Big Sur with macOS Server and possible the next macOS release to get more use out of the hardware. The Big Sur virtual machine performs well on the older Mac but sadly will not update.Was at 11.2 (having gotten to that from earlier 11.x release via re-install (preserves data) from recovery partition), and didn't want to go through that again when the updates weren't available via multiple mechanisms. Tried your solution, and saw the updates, which worked using Software Update. (very slow afterward for awhile, due to Spotlight dealing with all the replaced content; but that happens even on bare metal, although the VM scenario makes it slower still)
This was on a 2019 16" MBP host with 10.15.7 (Catalina) plus the supplementary update, and Parallels 16.1.3.
I did some trial and error on this first trying to simulate a Macmini8,1 but that made no difference. I have now got it updating though and it seems that your second line of boot arguments is the essential part. I have entered my iMac's board ID and even though the guest still identifies as a "Mac mini Server (Late 2012)" it the "About This Mac" it is downloading Big Sur 11.2.1 as I type. System Profiler now shows that the Mac mini's guest is an iMac so the guest is having an identity crisis. It's updating which is all that matters and hopefully it will be able to stay up to date.Being the Mac mini Server 2012 an unsupported model on Big Sur (only Mac mini 2014+) maybe you could try to insert the BoardID for a supported model, in the boot parameters...? Just an idea...