Public bug reported:
A 20.04 machine with grub-efi-amd64-signed that recently got upgraded fails
with:
"""
dpkg: error processing package grub-efi-amd64-signed (--configure):
installed grub-efi-amd64-signed package post-installation script subprocess
returned error exit status 1
"""
unfortunately not much more context was provided. After some debugging
it turns out that there are the following lines in /usr/lib/grub/grub-
multi-install:
"""
db_get "$question"
if [ -z "$RET" ]; then
# Reset the seen flag if the current answer is false, since
# otherwise we'll loop with no indication of why.
db_get grub-efi/install_devices_empty
if [ "$RET" = false ]; then
db_fset grub-efi/install_devices_empty seen false
fi
if db_input critical grub-efi/install_devices_empty; then
db_go
db_get grub-efi/install_devices_empty
if [ "$RET" = true ]; then
break
else
db_fset "$question" seen false
db_fset grub-efi/install_devices_empty seen false
fi
else
exit 1 # noninteractive
fi
"""
when grub-efi/install_devices_empty has the flag "seen" the line
if db_input critical grub-efi/install_devices_empty; then
will return "30" if the question was already shown but the rfset eset
happens only if the anser was "false" earlier. So the code jumps to
"exit 1".
So either the code need to always reset the seen flag ( db_fset grub-
efi/install_devices_empty seen false) or deal with exit code 30 from
"db_input critical grub-efi/install_devices_empty" more gracefully.
I can provide a /var/cache/debconf/config.dat to reproduce. I'm not
entirely sure how to reproduce from a clean install, the bug will only
happen after the first upgrade.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1896608
Title:
grub-multi-install fails with exit 1 when question grub-
efi/install_devices_empty is skipped
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