[[!comment format=mdwn username="gueux" avatar="http://cdn.libravatar.org/avatar/2982bac2c2cd94ab3860efb189deafc8" subject="comment 11" date="2017-12-22T12:10:37Z" content=""" So, I rebooted, but I still had the /dev/mapper/loop problem. I was able to \"dmsetup remove\" these, though... I deleted router.img and router.img.parttable... creating /srv/router.img of size 1.66 gigabytes loop deleted : /dev/loop0 mkfs.fat 4.1 (2017-01-24) loop deleted : /dev/loop0 26,456,191 100% 29.82MB/s 0:00:00 (xfr#5, to-chk=0/7) 770,763,841 99% 2.16MB/s 0:05:40 (xfr#26256, to-chk=0/33583) update-initramfs: Generating /boot/initrd.img-4.9.0-4-amd64 Generating grub configuration file ... Found linux image: /boot/vmlinuz-4.9.0-4-amd64 Found initrd image: /boot/initrd.img-4.9.0-4-amd64 done grub-install: error: /usr/lib/grub/i386-efi/modinfo.sh doesn't exist. Please specify --target or --directory. loop deleted : /dev/loop0 laptop built disk image /srv/router.img ... failed laptop overall ... failed ...and I'm back to the grub-install/grub-update problem, which seems to apply to grub-efi-amd64. It's weird, because it's the version I have on my laptop, and I did not notice this issue (but I installed debian on it a long time ago, so, the bug may have appeared since then). """]]