andrew@server:~/Downloads$ sudo apt-get -f autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages will be REMOVED:
  postgresql-contrib-9.1
0 upgraded, 0 newly installed, 1 to remove and 9 not upgraded.
2 not fully installed or removed.
After this operation, 2,031 kB disk space will be freed.
Do you want to continue [Y/n]?
(Reading database ... 202280 files and directories currently installed.)
Removing postgresql-contrib-9.1 ...
/var/lib/dpkg/info/postgresql-contrib-9.1.prerm: 10: .: Can't open /usr/share/postgresql-common/maintscripts-functions
dpkg: error processing postgresql-contrib-9.1 (--remove):
 subprocess installed pre-removal script returned error exit status 2
No apport report written because MaxReports is reached already
                                                              /var/lib/dpkg/info/postgresql-contrib-9.1.postinst: 7: .: Can't open /usr/share/postgresql-common/maintscripts-functions
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
 postgresql-contrib-9.1
E: Sub-process /usr/bin/dpkg returned an error code (1)