Old Ubuntu can not update??

404 on apt-get update

Edit "/etc/apt/sources.list"

Feisty has expired and no longer support. Therefore, the repos have been moved to http://old-releases.ubuntu.com/.

You need to replace the current repos in your /etc/apt/sources.list with the new repos, http://old-releases.ubuntu.com/.

Code:

deb http://old-releases.ubuntu.com/ubuntu feisty main restricted ..... .....

After that, do "sudo apt-get update" again.

You can get through the "failed to fetch" problem.