Hi MagnusB
No luck, result
richard@acerlptp:~$ sudo aptitude update
Ign
http://www.linuxmint.com daryna/ Release.gpg
Ign
http://www.linuxmint.com daryna/ Translation-en_US
Get:1
http://packages.medibuntu.org gutsy Release.gpg [189B]
Get:2
http://security.ubuntu.com gutsy-security Release.gpg [191B]
Ign
http://security.ubuntu.com gutsy-security/main Translation-en_US
Ign
http://security.ubuntu.com gutsy-security/restricted Translation-en_US
Get:3
http://archive.canonical.com gutsy Release.gpg [191B]
Ign
http://archive.canonical.com gutsy/partner Translation-en_US
Ign
http://packages.medibuntu.org gutsy/free Translation-en_US
Ign
http://packages.medibuntu.org gutsy/non-free Translation-en_US
Get:4
http://archive.ubuntu.com gutsy Release.gpg [191B]
Ign
http://archive.ubuntu.com gutsy/main Translation-en_US
Ign
http://www.linuxmint.com daryna/ Release
Ign
http://security.ubuntu.com gutsy-security/universe Translation-en_US
Ign
http://security.ubuntu.com gutsy-security/multiverse Translation-en_US
Hit
http://security.ubuntu.com gutsy-security Release
Hit
http://archive.canonical.com gutsy Release
Hit
http://packages.medibuntu.org gutsy Release
Ign
http://archive.ubuntu.com gutsy/restricted Translation-en_US
Ign
http://archive.ubuntu.com gutsy/universe Translation-en_US
Ign
http://archive.ubuntu.com gutsy/multiverse Translation-en_US
Get:5
http://archive.ubuntu.com gutsy-updates Release.gpg [191B]
Ign
http://archive.ubuntu.com gutsy-updates/main Translation-en_US
Ign
http://archive.ubuntu.com gutsy-updates/restricted Translation-en_US
Ign
http://www.linuxmint.com daryna/ Packages
Hit
http://security.ubuntu.com gutsy-security/main Packages
Ign
http://archive.ubuntu.com gutsy-updates/universe Translation-en_US
Ign
http://archive.ubuntu.com gutsy-updates/multiverse Translation-en_US
Hit
http://archive.ubuntu.com gutsy Release
Hit
http://www.linuxmint.com daryna/ Packages
Hit
http://archive.canonical.com gutsy/partner Packages
Ign
http://packages.medibuntu.org gutsy/free Packages
Hit
http://archive.ubuntu.com gutsy-updates Release
Hit
http://security.ubuntu.com gutsy-security/restricted Packages
Hit
http://security.ubuntu.com gutsy-security/universe Packages
Hit
http://security.ubuntu.com gutsy-security/multiverse Packages
Ign
http://packages.medibuntu.org gutsy/non-free Packages
Hit
http://archive.ubuntu.com gutsy/main Packages
Hit
http://archive.ubuntu.com gutsy/restricted Packages
Hit
http://archive.ubuntu.com gutsy/universe Packages
Hit
http://packages.medibuntu.org gutsy/free Packages
Hit
http://archive.ubuntu.com gutsy/multiverse Packages
Hit
http://archive.ubuntu.com gutsy-updates/main Packages
Hit
http://archive.ubuntu.com gutsy-updates/restricted Packages
Hit
http://archive.ubuntu.com gutsy-updates/universe Packages
Hit
http://packages.medibuntu.org gutsy/non-free Packages
Hit
http://archive.ubuntu.com gutsy-updates/multiverse Packages
Fetched 193B in 0s (314B/s)
Reading package lists... Done
richard@acerlptp:~$ sudo aptitude install firefox
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Building tag database... Done
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
Writing extended state information... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Building tag database... Done
richard@acerlptp:~$
By the way, L like the Dean Martin quote, I can vouch for its validity.
Oliverjames