just got this bug for the first time. here's my pstree:
$ sudo fuser /var/cache/debconf/config.dat
/var/cache/debconf/config.dat: 25743
$ sudo pstree -s 25743
init───frontend─┬─grub-pc.postins───ucf
└─whiptail
$ lsb_release -rd
Description: Ubuntu quantal (development branch)
Release: 12.10
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https://bugs.launchpad.net/bugs/349469
Title:
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by
another process: Resource temporarily unavailable
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