Brad, your pstree output shows an orphaned dpkg process:
├─dpkg───frontend─┬─preinst
│ └─whiptail
Do you know how this process was launched? Did you run apt-get or dpkg
from a terminal and then close the terminal?
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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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