Hello, I’ve tested the installer in a UEFI setup like this: qemu-img create -f qcow2 /tmp/t.img 2G $(guix system vm gnu/system/install.scm) -m 256 -net user \ -hda /tmp/t.img \ -bios $(guix build ovmf)/share/firmware/ovmf_x64.bin Sometimes, the installer crashes with the attached backtrace: EBUSY while mounting /mnt/boot/efi. Strangely, if I go to a console at that point and run ‘mount’, I see that /mnt/boot/efi is already mounted. Thoughts? Ludo’.