经过一番研究后，我发现我的 source.list 文件存在一些问题。
我附上了错误和我的 source.list 文件。有人能指导我删除/更新/插入哪些行才能使其正常工作吗？
我已经注释了几行代码，减少了错误数量。现在，我无法继续操作了。
错误
W:The repository 'http://archive.ubuntu.com/ubuntu xenial Release'
does not have a Release file.
W:The repository 'http://archive.ubuntu.com/ubuntu xenial-updates Release' does not have a Release file.,
W:The repository 'http://archive.ubuntu.com/ubuntu xenial-backports Release' does not have a Release file.,
W:The repository 'http://archive.ubuntu.com/ubuntu xenial-security Release' does not have a Release file.
E:Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/multiverse/source/Sources Connection failed [IP: 91.189.88.149 80],
E:Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/multiverse/source/Sources Connection failed [IP: 91.189.88.149 80],
E:Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/main/source/Sources Connection failed [IP: 91.189.88.149 80],
E:Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-security/multiverse/source/Sources Connection failed [IP: 91.189.88.149 80],
来源列表
# deb cdrom:[Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2)]/ xenial 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 xenial main restricted
deb-src http://archive.ubuntu.com/ubuntu xenial multiverse universe
restricted main #Added by software-properties
# deb-src http://in.archive.ubuntu.com/ubuntu/ xenial main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu xenial-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu xenial-updates multiverse universe restricted main #Added by software-properties
# deb-src http://in.archive.ubuntu.com/ubuntu/ xenial-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 xenial universe
# deb-src http://in.archive.ubuntu.com/ubuntu/ xenial universe
deb http://archive.ubuntu.com/ubuntu xenial-updates universe
# deb-src http://in.archive.ubuntu.com/ubuntu/ xenial-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.
deb http://archive.ubuntu.com/ubuntu xenial multiverse
# deb-src http://in.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://archive.ubuntu.com/ubuntu xenial-updates multiverse
# deb-src http://in.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
## 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 xenial-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-backports main restricted
universe multiverse #Added by software-properties
# deb-src http://in.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
## 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 xenial partner
# deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://archive.ubuntu.com/ubuntu xenial-security main restricted
deb-src http://archive.ubuntu.com/ubuntu xenial-security multiverse universe restricted main #Added by software-properties
# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://archive.ubuntu.com/ubuntu xenial-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb http://archive.ubuntu.com/ubuntu xenial-security multiverse
# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse