Ubuntu Update old Repositories

Find Ubuntu version:

1. In a terminal execute:
   lsb_release -dc
   
2.  The output will be something like this:
   Description: Ubuntu 9.10
   Codename: karmic
   Open file /etc/apt/sources.list with a text editor. 
   Delete all entries and substitute with the following:
   
   
   

   deb http://old-releases.ubuntu.com/ubuntu/ CODENAME main universe restricted multiverse
   deb-src http://old-releases.ubuntu.com/ubuntu/ CODENAME main universe restricted multiverse
   
   deb http://old-releases.ubuntu.com/ubuntu/ CODENAME-security main universe restricted multiverse
   deb-src http://old-releases.ubuntu.com/ubuntu/ CODENAME-security main universe restricted multiverse
   
   deb http://old-releases.ubuntu.com/ubuntu/ CODENAME-updates main universe restricted multiverse
   deb-src http://old-releases.ubuntu.com/ubuntu/ CODENAME-updates main universe restricted multiverse

   
   
   Extra Repository
    
   Backports: 

deb http://old-releases.ubuntu.com/ubuntu/ CODENAME-backports main restricted universe multiverse deb-src http://old-releases.ubuntu.com/ubuntu/ CODENAME-backports main restricted universe multiverse 

Proposed:

deb http://old-releases.ubuntu.com/ubuntu/ CODENAME-proposed main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ CODENAME-proposed main restricted universe multiverse  

 Replace the worh CODENAME with the codename found in point 2