I can confirm this behavior. To test:
# touch /var/lib/dpkg/updates/24234
$ aptdcon -i 2vcard
[hang]
$ software-center
will show "waiting for other software managers to quit".
** Changed in: software-center (Ubuntu)
Status: New => Invalid
** Changed in: aptdaemon (Ubuntu)
Status: New => Confirmed
** Changed in: aptdaemon (Ubuntu)
Importance: Undecided => High
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aptd hangs if the cache is in "dpkg was interrupted" state
https://bugs.launchpad.net/bugs/446262
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