- explicitly instruct to add --boot=efi to autopkgtest-virt-qemu
- add example how to run autopkgtest with --boot=efi
- document image location requirements giving unshare restrictions
- check if foreign arch is configured
- instruct how to add a foreign architecture
- check that the unshared user is able to access the image location
- suggest to install qemu-system-* packages if they are missing
- suggest to install packages containing EDK II OVMF UEFI firmware