Hello, I am experiencing this as well. Interrupting the upgrade and running dpkg --configure -a resulted in the same lockup.
Dovecot is running and mail delivery still works, at least. Please let me know if you need any further information. sney -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org