As of April 25th Ubuntu 6.10 (a.k.a Edgy Eft) is no longer supported. Any attempt to update the software from the standard repositories will therefore result in broken links.
To be able to upgrade the system the first task is to update the system to 7.04 (Feisty Fawn). This is done by replacing all instances of ‘edgy’ in the file /etc/apt/sources.list with ‘feisty’. This can be done manually using a text editor of choice or by running the following command.
sudo sed -e 's/\sedgy/ feisty/g' -i /etc/apt/sources.list
After that it should be possible to run ‘apt-get update’ followed by ‘apt-get dist-upgrade’ to upgrade the system to 7.04. Once there it is possible to use the standard method of upgrading to newer releases:
sudo apt-get install update-manager-core
During the upgrade process you will have to answer questions on what to do with files which have been edited. Run the above multiple times to upgrade to the newest version. It is possible to check the current version by running ‘cat /etc/issue’.