Plesk repair did not help - it seems the problem was more dovecot going haywire. I fixed it by removing dovecot manually:
# dpkg -r plesk-dovecot-imap-driver
# dpkg -r plesk-dovecot
Afterwards I switched plesk to use courier, and everything went on fine from there. I assume that dovecot went...
Hi,
plesk recently tried to update dovecot on my server - for some reason, installation hangs.
[2016-12-21 11:13:56.390716] E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem.
Bootstrapper has finished action (exec time: 0 sec.)...