我在终端中运行 sudo apt-get update 时收到此消息：- Duplicate sources.list entry http://archive.canonical.com/ubuntu/precision/partner i386 Packages (/var/lib/apt/lists/archive .canonical.com_ubuntu_dists_precise_partner_binary-i386_Packages）
所以我运行了命令 gksu gedit /etc/apt/sources.list 并检查了源代码以发现没有重复项，无论如何我都看不到。这是来源：-
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted
deb-src http://archive.ubuntu.com/ubuntu precise main restricted #Added by software-properties
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise restricted main multiverse universe #Added by software-properties
## Major bug fix updates produced after the final release of …