The subject is typically located in grub2 sources
(http://bazaar.launchpad.net/~ubuntu-core-
dev/ubuntu/quantal/grub2/quantal) (in debian/config.in), and in
/var/lib/dpkg/info/grub-pc.config while installed.
The purpose of this file I think is to provide scripted actions to reconfigure
installed package, being invoked (for example) within dpkg-reconfigure
operation:
dpkg-reconfigure -f noninteractive grub-pc
The script does unconditional update of debconf-selections database, used as
source for reconfiguration items to update. E.g. if I setup debconf-selections
against grub2/linux_cmdline with adding new stuff, the installed and existing
/etc/default/grub will stay unchanged as a result after dpkg-reconfigure, even
more my administratively customized debconf-selections will be overwritten by
this script to be the same as in /etc/default/grub.
I use debconf-selections database as a source of parameters to imperatively
initiate of updating/upgrading existing /etc/default/grub, but it is
impossible, moreover it makes debconf-selections database dirty and thus -
useless, since these db_set updates always come intact with /etc/default/grub
hand changes after reconfiguring. So I am unable to understand the purpose of
this unconditional update.
>From other hand, all things become clear and working if I comment the code
>piece:
# if test -e /etc/default/grub ; then
# . /etc/default/grub
# db_set grub2/linux_cmdline "$GRUB_CMDLINE_LINUX"
# db_set grub2/linux_cmdline_default "$GRUB_CMDLINE_LINUX_DEFAULT"
# case grub-pc in
# grub-pc)
# if [ "${GRUB_TIMEOUT}" != "" ]; then
# db_set grub-pc/timeout "$GRUB_TIMEOUT"
# fi
# if [ "${GRUB_HIDDEN_TIMEOUT}" != "" ]; then
# db_set grub-pc/hidden_timeout true
# elif egrep -q '^#?[[:space:]]*GRUB_HIDDEN_TIMEOUT=' /etc/default/grub; then
# db_set grub-pc/hidden_timeout false
# fi
# ;;
# esac
# fi
Please, tell me some words about what is the correct way with this script to
use dpkg-reconfigure effectively! Any suggestions would be very helpful, thanks!
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https://bugs.launchpad.net/bugs/1053368
Title:
grub-pc.config failed to retrieve and apply debconf database config
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