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Ubuntu 12.04上的'sudo apt-get update'错误
当我输入时,sudo apt-get update我得到: mohd-arafat-hossain@TUD:~$ sudo apt-get update [sudo] password for mohd-arafat-hossain: Ign http://bd.archive.ubuntu.com precise InRelease Ign http://bd.archive.ubuntu.com precise-updates InRelease Ign http://bd.archive.ubuntu.com precise-backports InRelease Ign http://bd.archive.ubuntu.com precise Release.gpg Ign http://bd.archive.ubuntu.com precise-updates Release.gpg Ign http://bd.archive.ubuntu.com precise-backports Release.gpg Ign http://bd.archive.ubuntu.com precise Release Ign http://bd.archive.ubuntu.com precise-updates Release Ign http://bd.archive.ubuntu.com precise-backports Release Ign http://extras.ubuntu.com precise …