ubuntu20.04LTS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.listcentos和ubuntu
php属于网页的文件类型吗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/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb cn.archive.ubuntu/ubuntu/ focal main restricted
# deb-src cn.archive.ubuntu/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb cn.archive.ubuntu/ubuntu/ focal-updates main restricted
# deb-src cn.archive.ubuntu/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/ubuntu/ focal universe
# deb-src cn.archive.ubuntu/ubuntu/ focal universe
deb cn.archive.ubuntu/ubuntu/ focal-updates universe
播放教程用英语怎么说正则表达式匹配html# deb-src cn.archive.ubuntu/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/ubuntu/ focal multiverse
# deb-src cn.archive.ubuntu/ubuntu/ focal multiverse
deb cn.archive.ubuntu/ubuntu/ focal-updates multiverse
# deb-src cn.archive.ubuntu/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
c语言颜函数color怎么使用## 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/ubuntu/ focal-backports main restricted universe multiverse
# deb-src cn.archive.ubuntu/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/ubuntu focal partner
# deb-src archive.canonical/ubuntu focal partner
deb security.ubuntu/ubuntu focal-security main restricted
# deb-src security.ubuntu/ubuntu focal-security main restricted
deb security.ubuntu/ubuntu focal-security universe
# deb-src security.ubuntu/ubuntu focal-security universe
deb security.ubuntu/ubuntu focal-security multiverse
# deb-src security.ubuntu/ubuntu focal-security multiverse
# This system was installed using small removable media
forma是什么意思中文# (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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