Just had exactly that problem on a 18.04 installation at the end.
It was a EFI installation and grub wanted to remove "grub-pc".
As described above, the prerm script tried to db_get the variable
grub-pc/chainload_from_menu.lst.
grub-pc version is the latest from bionic-update (2.04-1ubuntu35.2).
-- prerm ------
#!/bin/bash
set -e
case "$1" in
remove|deconfigure)
. /usr/share/debconf/confmodule
db_get grub-pc/chainload_from_menu.lst <---- here the scripts
aborts
if $RET && test -e /boot/grub/menu.lst ; then
...
---------------
Because of "set -e", the scripts aborts when the variable is not
available.
Looking into grub-pc's config script, i find this:
db_input high grub-pc/chainload_from_menu.lst || true
Maybe this would be a good improvement for the prerm script?
The only workaround I think of, is to preseed that variable, hoping it
doesn't harm anything.
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https://bugs.launchpad.net/bugs/347532
Title:
[jaunty] package grub-pc 1.96+20080724-12ubuntu2 failed to
install/upgrade: sub-process pre-removal script returned 10
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