dpkg: warning: downgrading irssi from 0.8.15-5ubuntu3 to 0.8.15-1ubuntu1~lucid1
(Reading database ... 727695 files and directories currently installed.)
Preparing to unpack irssi_0.8.15-1ubuntu1~lucid1_amd64.deb ...
Unpacking irssi (0.8.15-1ubuntu1~lucid1) over (0.8.15-5ubuntu3) ...
dpkg: dependency problems prevent configuration of irssi:
 irssi depends on libperl5.10 (>= 5.10.1); however:
  Package libperl5.10 is not installed.
 irssi depends on libssl0.9.8 (>= 0.9.8k-1); however:
  Package libssl0.9.8 is not installed.
 irssi depends on perlapi-5.10.1; however:
  Package perlapi-5.10.1 is not installed.

dpkg: error processing package irssi (--install):
 dependency problems - leaving unconfigured
Processing triggers for doc-base (0.10.5) ...
Processing 3 changed doc-base files...
Registering documents with scrollkeeper...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Errors were encountered while processing:
 irssi
e@e:~$ sudo apt-get -f install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
  irssi
Suggested packages:
  irssi-scripts
The following packages will be upgraded:
  irssi
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 885 kB of archives.
After this operation, 668 kB disk space will be freed.
Do you want to continue? [Y/n] n
Abort.