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安装 ubuntu12.04，命令行更新出现：
W: Duplicate sources.list entry https://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages)
W: Duplicate sources.list entry https://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages)
出现重复的链接！
将sources.list文件的https://extras.ubuntu.com/开头的链接都注释掉
#deb https://extras.ubuntu.com/ubuntu precise main
#deb https://extras.ubuntu.com/ubuntu precise main
#deb-src https://extras.ubuntu.com/ubuntu precise main
#deb-src https://extras.ubuntu.com/ubuntu precise main
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted
然后重新运行：sudo apt-get update。