Ok, I go into application manager and select 'refresh application list' and get the message 'Unable to refresh list. Last refreshed list is shown'.

The last refreshed list is dated 17/04/2007.

The log shows the following:

W:Couldn't stat source package list http://idefix.go-nix.ca Packages (var/lib/apt/lists/idefix.go-nix.ca_nix_gaim-dist_Packages) - stat (2 No such file or directory)
W:You may want to run apt-get update to correct these problems
WGPG error: http://catagogue.tableteer.nokia.com bora release: the following signatures were invalid: BADSIG CBFC2BECC6903E72 Nokia Internet Tablet Archive Automatic Signing Key etc etc

This all really means very little to me?!?!?

Any ideas?