操作步骤如下：

# 备份好原来的源
$ sudo cp /etc/apt/sources.list /etc/apt/sources.list.bat 
$ sudo vi /etc/apt/sources.list
# 清除里面的所有内容：命令模式:%d
# 复制以下内容到/etc/apt/sources.list
# deb cdrom:[Ubuntu 22.04 LTS _Jammy Jellyfish_ - Release amd64 (20220419)]/ jammy main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted
# deb-src http://cn.archive.ubuntu.com/ubuntu/ jammy main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted
# deb-src http://cn.archive.ubuntu.com/ubuntu/ jammy-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://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy universe
# deb-src http://cn.archive.ubuntu.com/ubuntu/ jammy universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates universe
# deb-src http://cn.archive.ubuntu.com/ubuntu/ jammy-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://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ jammy multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ jammy-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://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted
# deb-src http://security.ubuntu.com/ubuntu jammy-security main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security universe
# deb-src http://security.ubuntu.com/ubuntu jammy-security universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security multiverse
# deb-src http://security.ubuntu.com/ubuntu jammy-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.

# 保存退出
# 更新源
$ sudo apt upgrage && sudo apt update