As to grub.cfg: I set GRUB_TIMEOUT=5 in my /etc/default/grub, but the timeout for efi was reset to 30 on every update. I didn't know that files in /etc/default/grub.d are supposed to be changed, but I now changed
if [ \$grub_platform = efi ]; then
set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}
if [ x\$feature_timeout_style = xy ] ; then
set timeout_style=menu
fi
fi
in /etc/grub.d/00_header to ... GRUB_RECORDFAIL_TIMEOUT:-5 ... and hope
that this helps in the future.
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https://bugs.launchpad.net/bugs/1929854
Title:
Vital and critical configuration files get overridden by system
updates without warning
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