If you use the Ubuntu Personal Package Archives (https://launchpad.net/ubuntu/+ppas) then forget about opening /etc/apt/sources.list to add a repository; in Karmic, use the new add-apt-repository command. For example, to add the repository for the chromium browser, just run: sudo add-apt-repository ppa:chromium-daily The PPA’s repository will be automatically added and so will the GPG key. Search Ubuntu … Continue reading Ubuntu Tip : Simplified way to add PPA repositories in Karmic