ubuntu20.04 LTS系统默认源sources.list文件的修改

 更新时间：2020年08月23日 16:51:47   作者：zj@zlab  

这篇文章主要介绍了ubuntu20.04 LTS系统默认源sources.list文件的修改，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧

如果不慎修改了source.list内容，导致一系列错误，建议恢复默认源文件。

sudo gedit /etc/apt/sources.list

然后把下面默认源内容复制进去

ubuntu20.LTS系统默认源sources.list文件内容

#deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main restricted

# See help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb cn.archive.ubuntu.com/ubuntu/ focal main restricted
# deb-src cn.archive.ubuntu.com/ubuntu/ focal main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb cn.archive.ubuntu.com/ubuntu/ focal-updates main restricted
# deb-src cn.archive.ubuntu.com/ubuntu/ focal-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 cn.archive.ubuntu.com/ubuntu/ focal universe
# deb-src cn.archive.ubuntu.com/ubuntu/ focal universe
deb cn.archive.ubuntu.com/ubuntu/ focal-updates universe
# deb-src cn.archive.ubuntu.com/ubuntu/ focal-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 cn.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src cn.archive.ubuntu.com/ubuntu/ focal multiverse
deb cn.archive.ubuntu.com/ubuntu/ focal-updates multiverse
# deb-src cn.archive.ubuntu.com/ubuntu/ focal-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 cn.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
# deb-src cn.archive.ubuntu.com/ubuntu/ focal-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 archive.canonical.com/ubuntu focal partner
# deb-src archive.canonical.com/ubuntu focal partner

deb security.ubuntu.com/ubuntu focal-security main restricted
# deb-src security.ubuntu.com/ubuntu focal-security main restricted
deb security.ubuntu.com/ubuntu focal-security universe
# deb-src security.ubuntu.com/ubuntu focal-security universe
deb security.ubuntu.com/ubuntu focal-security multiverse
# deb-src security.ubuntu.com/ubuntu focal-security multiverse

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

可以有效解决很多报错