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

14.04的：

###### Ubuntu Main Repos

deb http://archive.ubuntu.com/ubuntu trusty main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty main restricted universe multiverse

###### Ubuntu Update Repos
deb http://archive.ubuntu.com/ubuntu trusty-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse

###### Ubuntu Partner Repo
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner

###### Ubuntu Extras Repo
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main