# See <http://help.ubuntu.com/community/UpgradeNotes> for how to upgrade to
# newer versions of the distribution.
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal main restricted
# deb-src <https://mirrors.shanhe.com/ubuntu> focal main restricted
 
## Major bug fix updates produced after the final release of the
## distribution.
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal-updates main restricted
# deb-src <https://mirrors.shanhe.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 <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal universe
# deb-src <https://mirrors.shanhe.com/ubuntu> focal universe
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal-updates universe
# deb-src <https://mirrors.shanhe.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 <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal multiverse
# deb-src <https://mirrors.shanhe.com/ubuntu> focal multiverse
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal-updates multiverse
# deb-src <https://mirrors.shanhe.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 <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal-backports main restricted universe multiverse
# deb-src <https://mirrors.shanhe.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 <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal-security main restricted
# deb-src <https://mirrors.shanhe.com/ubuntu> focal-security main restricted
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal-security universe
# deb-src <https://mirrors.shanhe.com/ubuntu> focal-security universe
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu> focal-security multiverse
# deb-src <https://mirrors.shanhe.com/ubuntu> focal-security multiverse