Public bug reported:
File: /usr/lib/os-probes/50mounted-tests
Issue: on a respin of Ubuntu (yes, not supported but I believe the issue
could possibly affect Ubuntu as well) when booting the USB in 'secure
boot' UEFI mode, when installing, the update-grub command gives the
following error which then stops the installer with the all-too-common
"failed to install grub-efi-amd64-signed" to /target error:
grub-probe: error: cannot find a GRUB drive for /dev/sdb1. Check your
device.map.
The problem is, however, that in this case /dev/sdb1 is the live
system's "cdrom" and should NOT be probed! So I propose the following
addition to 50mounted-tests that would ensure "optical media" partitions
would be skipped by os-prober:
elif [ "$types" = iso9660 ]; then
debug "$1 is an optical media iso9660 partition; skipping"
exit 0
With this addition, update-grub no longer returns an error which I am
hoping will make ubiquity not give the following error:
ubiquity: installed grub-efi-amd64-signed package post-installation script
subprocess returned error exit status 127
ubiquity: Errors were encountered while processing:
ubiquity: grub-efi-amd64-signed
ubiquity: E: Sub-process /usr/bin/dpkg returned an error code (1)
I hope this addition will help others that have issues with secure boot
mode! I have not created a patch yet but can if it seems acceptable.
** Affects: os-prober (Ubuntu)
Importance: Undecided
Status: New
** Tags: grub secure ubiquity uefi
** Tags added: grub ubiquity
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https://bugs.launchpad.net/bugs/1819363
Title:
uefi: os-prober doesn't skip cdrom iso9660 type
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