Hopefully another data point: I accidentally started an install of the
"ppm" package using "sudo apt-get install ppm" (I had the wrong package
name), and it appeared to try to install kexec-tools.  It hung during
setup of kexec-tools (similar to
http://ubuntuforums.org/archive/index.php/t-1214718.html), so I
interrupted the process.  After this, I could not get pending set-up to
finish because /var/cache/debconf/config.dat was locked, like so:

~% pstree -alps 8300
init,1
  └─aptd,3060 /usr/sbin/aptd
      └─dpkg,3098 --status-fd 14 --configure -a --force-confdef --force-confold
          └─frontend,8300 -w /usr/share/debconf/frontend 
/var/lib/dpkg/info/kexec-tools.postinst configure 1:2.0.2-1ubuntu4
              └─kexec-tools.pos,8303 /var/lib/dpkg/info/kexec-tools.postinst 
configure 1:2.0.2-1ubuntu4
                  └─update-grub,8313 /usr/sbin/update-grub

I was able to kill -kill 8313 (update-grub), then clean up as suggested
in this bug.

~% lsb_release -rd
Description:    Ubuntu 12.04.1 LTS
Release:        12.04

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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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