After you’ve used Ubuntu for a while you gone understand that not all the default applications are updated to the last version. There is a good reason for this : Ubuntu launches a new OS version every six months and in that time, the team tests and looks for any integration errors.
However, if there are some new,cool updates you want for your applications then you need to risk a little and install it directly from the owner site. You can do this using a lot of GUI applications but the best and simple way is by using the command line.
The following list is added at the end of my repository file.
#MY REPOS
deb http://ppa.launchpad.net/openoffice-pkgs/ubuntu intrepid main
deb http://ppa.launchpad.net/do-core/ppa/ubuntu intrepid main
deb http://ppa.launchpad.net/deluge-team/ubuntu intrepid main
deb http://dl.google.com/linux/deb/ stable non-free #Google
deb http://wine.budgetdedicated.com/apt intrepid main #WineHQ
#My keys
#OpenOffice – http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0x60D11217247D1CFF
#Gnome-DO – http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0x28A8205077558DD0
#Deluge – http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0xC5E6A5ED249AD24C
#Google – https://dl-ssl.google.com/linux/linux_signing_key.pub
#WineHQ – http://wine.budgetdedicated.com/apt/Scott%20Ritchie.gpg
In order to edit this file you need to run this command : sudo gedit /etc/apt/sources.list. When the text editor opens you can copy paste the content I just showed you.
Now, Ubuntu has the path set, and will search it for new updates. To be safe an extra step is needed : to add the permissions for each of the link. To do so , the best way is to open in the browser the links at the end. You go to that site , copy paste the key in a text file one by one. After each new key you have to use a simple GUI interface to add it to your system. System->Administration->Software Source. Select the text file and you’re done.
To update your software list : sudo apt-get update
To update the software on your computer : sudo apt-get upgrade
If you did this steps you should not have any error displayed.
The link to the keys might change in the future and you have to search it again or just visit this blog and see posted updates.