us.archive.ubuntu.com is known to have problems time and again. Please use some different mirror. Also comment lines containing feisty-updates and feisty-security as these repositories don't exist yet.
-- Repositories not resolving https://launchpad.net/bugs/89559 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
