the new package installed nice, without changing my configuration so it looks like this patch fixes the bug. Note: I get standard errors about an unconfigured nsd3 everytime I use apt which is related to another bug. Anyway, the dovecot installation went fine, without any problems and did not change my mail configuration as can be seen by etckeeper/git. root@lock:/etc# git status # On branch master nothing to commit (working directory clean) root@lock:/etc# sudo apt-get install dovecot Reading package lists... Done Building dependency tree Reading state information... Done Package dovecot is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However the following packages replace it: dovecot-common E: Package dovecot has no installation candidate root@lock:/etc# sudo apt-get install dovecot-common Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: dovecot-imapd dovecot-pop3d Suggested packages: ntp The following packages will be upgraded: dovecot-common dovecot-imapd dovecot-pop3d 3 upgraded, 0 newly installed, 0 to remove and 14 not upgraded. 1 not fully installed or removed. Need to get 7,805kB of archives. After this operation, 0B of additional disk space will be used. Do you want to continue [Y/n]? y Get:1 http://archive.ubuntu.com/ubuntu/ lucid-proposed/main dovecot-pop3d 1:1.2.9-1ubuntu6.5 [1,093kB] Get:2 http://archive.ubuntu.com/ubuntu/ lucid-proposed/main dovecot-imapd 1:1.2.9-1ubuntu6.5 [1,202kB] Get:3 http://archive.ubuntu.com/ubuntu/ lucid-proposed/main dovecot-common 1:1.2.9-1ubuntu6.5 [5,510kB] Fetched 7,805kB in 6s (1,234kB/s) (Reading database ... 27371 files and directories currently installed.) Preparing to replace dovecot-pop3d 1:1.2.9-1ubuntu6.4 (using .../dovecot-pop3d_1%3a1.2.9-1ubuntu6.5_amd64.deb) ... * Stopping IMAP/POP3 mail server dovecot ...done. Unpacking replacement dovecot-pop3d ... * Starting IMAP/POP3 mail server dovecot ...done. Preparing to replace dovecot-imapd 1:1.2.9-1ubuntu6.4 (using .../dovecot-imapd_1%3a1.2.9-1ubuntu6.5_amd64.deb) ... * Stopping IMAP/POP3 mail server dovecot ...done. Unpacking replacement dovecot-imapd ... * Starting IMAP/POP3 mail server dovecot ...done. Preparing to replace dovecot-common 1:1.2.9-1ubuntu6.4 (using .../dovecot-common_1%3a1.2.9-1ubuntu6.5_amd64.deb) ... * Stopping IMAP/POP3 mail server dovecot ...done. Unpacking replacement dovecot-common ... Processing triggers for ufw ... Rules updated for profile 'Dovecot Secure IMAP' Rules updated for profile 'OpenSSH' Rules updated for profile 'Postfix' Rules updated for profile 'Postfix Submission' Skipped reloading firewall Processing triggers for ureadahead ... Processing triggers for man-db ... Setting up nsd3 (3.2.4-1) ... * Starting nsd3... invoke-rc.d: initscript nsd3, action "start" failed. dpkg: error processing nsd3 (--configure): subprocess installed post-installation script returned error exit status 1 Setting up dovecot-common (1:1.2.9-1ubuntu6.5) ... You already have ssl certs for dovecot. update-rc.d: warning: dovecot stop runlevel arguments (1) do not match LSB Default-Stop values (0 1 6) * Starting IMAP/POP3 mail server dovecot ...done. Setting up dovecot-pop3d (1:1.2.9-1ubuntu6.5) ... * Restarting IMAP/POP3 mail server dovecot ...done. Setting up dovecot-imapd (1:1.2.9-1ubuntu6.5) ... * Restarting IMAP/POP3 mail server dovecot ...done. Errors were encountered while processing: nsd3 E: Sub-process /usr/bin/dpkg returned an error code (1) root@lock:/etc# git status # On branch master nothing to commit (working directory clean)