Why can't Update Manager find any updates?

Question

My update manager does not find any updates. It does not crash or anything, but no update for my ubuntu, except for the PPAs. At first I thought there really was no update out there, but now it has been more than a month since my last update. What is wrong here?

$ cat /etc/apt/sources.list
deb http://ir.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse

(I also tried the MainServers, but still nothing.)

http://paste.ubuntu.com/1162185/

Answer 1

You must have the -updates and -security repositories set!

You aren't getting any updates because they go into the precise-updates and precise-security repositories, and you only have the main precise repository in your sources.list!

• Set up Software Sources this way:

  

• Or if you want to manually edit /etc/apt/sources.list, add the following two lines:

  deb http://ir.archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse
  deb http://ir.archive.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse