ubuntu20.04 LTS系统默认源sources.list文件的修改

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

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

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

sudo apt update

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