apt-get update每当我在终端中尝试 sudo 时，它都会引发以下错误：-
Err http://archive.canonical.com precise InRelease
Err http://archive.canonical.com precise Release.gpg
Unable to connect to 111.125.139.199:8105:
Err http://archive.ubuntu.com precise InRelease
Err http://archive.ubuntu.com precise Release.gpg
Unable to connect to 111.125.139.199:8105:
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/precise/InRelease
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/InRelease
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/Release.gpg Unable to connect to 111.125.139.199:8105:
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/precise/Release.gpg Unable to connect to 111.125.139.199:8105:
W: Some index files failed to download. They have been ignored, or old ones used instead.
还出现了以下问题，可能是由于同一问题造成的：-
/etc/apt/sources.list 的内容：-
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ dists/precise/main/binary-i386/
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ dists/precise/restricted/binary-i386/
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ precise main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution. deb http://archive.ubuntu.com/ubuntu precise main restricted deb-src http://archive.ubuntu.com/ubuntu precise main restricted
## Major bug fix updates produced after the final release of the
## distribution. deb http://archive.ubuntu.com/ubuntu precise-updates main restricted deb-src http://archive.ubuntu.com/ubuntu precise-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team. deb http://archive.ubuntu.com/ubuntu precise universe deb-src http://archive.ubuntu.com/ubuntu precise universe deb http://archive.ubuntu.com/ubuntu precise-updates universe deb-src http://archive.ubuntu.com/ubuntu precise-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team. deb http://archive.ubuntu.com/ubuntu precise-backports main restricted universe deb-src http://archive.ubuntu.com/ubuntu precise-backports main restricted universe
deb http://archive.ubuntu.com/ubuntu precise-security main restricted deb-src http://archive.ubuntu.com/ubuntu precise-security main restricted deb http://archive.ubuntu.com/ubuntu precise-security universe deb-src http://archive.ubuntu.com/ubuntu precise-security universe
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users. deb http://archive.canonical.com/ubuntu precise partner deb-src http://archive.canonical.com/ubuntu precise partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
# deb http://extras.ubuntu.com/ubuntu precise main
# deb-src http://extras.ubuntu.com/ubuntu precise main
答案1
检查你的互联网连接是否正常。然后进入更新中心，进入设置并取消选中出现错误的来源。或者查看这个答案Apt-Get 更新：获取失败；无法连接到任何源