up: linux  
linux - managing repositoriesWhat links here?
source list is at:
/etc/apt/sources.list 
  1. start Ubuntu Software Center
  2. select edit -> software sources...
  3. click add


maybe run apt-get update

Resources
ubuntu documentation - Repositories/Ubuntu
linux - managing repositories
filename:linux - managing repositories
filename:linux%20%2D%20managing%20repositories
last edit:October 27 2014 19:44:30 (3477 days ago)
ct = 1714952403.000000 = May 05 2024 19:40:03
ft = 1414453470.000000 = October 27 2014 19:44:30
dt = 300498933.000000