Experiencing in Ubuntu 12.10 [Quantal] as well . Perhaps it is related to the fact that 'Quantal Package List Contains Sources That Cannot Be Downloaded' (Bug #1003042 refers: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1003042). Basically when you use APTITUDE to to a similar thing you get:
W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/quantal/main/source/Sources 404 Not Found , W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead. Unfortunately, we cant use Ubuntu-bug to report the error because it doesn't stay active long enough to capture the PID. I simply opens, thinks for a second, and then closes gracefully. ** Summary changed: - Ubuntu Software Center does not load + Ubuntu Software Center Loads and then Closes -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to software-center in Ubuntu. https://bugs.launchpad.net/bugs/1003218 Title: Ubuntu Software Center Loads and then Closes Status in “software-center” package in Ubuntu: Confirmed Bug description: Ubuntu 12.04 after upgrading the system does not load the software center of ubuntu, as it is thinking and then closes automatically, shows no internal error message but it is a failure that happens in my pc because I can not access the center ubuntu software. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/1003218/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

