Linux support

[franklefebvre]

This update allows to install and boot from some ARM-based Linux distributions (tested successfully with many versions of Ubuntu -- couldn't make it work with CentOS so far.)

The option is visible only when available (macOS 13+)

To install a Linux system:

• choose the first install method ("Open custom IPSW or ISO file from local storage)
• select .iso file and configure the VM
• start the VM with the "Boot on install drive" option enabled
• proceed with Linux installation
• when Linux is installed, close the VM and restart it (the "Boot on install drive" option should be off)
• enjoy!

Some classes/structs need to be renamed (VBMacConfiguration etc). I chose to keep them unmodified for now in order not to add too much noise to this MR.

[insidegui]

Thanks a lot @franklefebvre for contributing this.

I'll take a moment during this week to review it and do some QA.

[insidegui]

I don't see any major issues with the changes made in the PR, only minor tweaks we can do over time.

However, I'm having trouble testing this. I'm getting an immediate shutdown of the Linux VM with "EFI Boot Options returned. Exiting VM" briefly shown on the display. Perhaps I got the wrong ISO? The one I tried was ubuntu-22.04.2-desktop-amd64.iso.

Future improvements (that I plan on doing myself, but wouldn't mind someone else PR'ing first :P)

• I think the install wizard would be easier to use if the first option was to pick between "macOS" and "Other", then each OS choice would lead to a different picker
• Related to the above, we could probably host a repository for other OSes like we do for macOS
• Since installation works differently for Linux, where the VM is booted from the install image, the VM could be automatically started at the end of the initial setup, with the appropriate option already selected
• The configuration UI should hide/disable options that are not available for the given guest OS (such as display PPI and trackpad device)

[franklefebvre]

Thank you @insidegui for reviewing my PR.

ubuntu-22.04.2-desktop-amd64.iso is an installer for AMD/Intel architecture. Usually ARM installers have either arm64 or aarch64 in their names.
Currently there is no "stable" version of Ubuntu Desktop for ARM, but you can download a daily build from this page: https://cdimage.ubuntu.com/focal/daily-live/current/ (choose the 64-bit ARM image at the top)

[insidegui]

Duh, I totally missed that distinction 🤦‍♂️ Will try it out again with that one 😄

[insidegui]

This is good to go for now, and I'm already working on some of the improvements I mentioned :)

[insidegui]

Oh and thanks again @franklefebvre for this fantastic contribution 🥳

[jgresham]

Tested Fedora 38 workstation arm on my macbook m1 and it works well. Thanks for adding Linux! @franklefebvre @insidegui