修改/etc/apt/sources.list.save文件
# 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://mirrors.tuna.tsinghua.edu.cn/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://mirrors.tuna.tsinghua.edu.cn/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://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy universe deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates universe # deb-src http://mirrors.tuna.tsinghua.edu.cn/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://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates multiverse # deb-src http://mirrors.tuna.tsinghua.edu.cn/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://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted # deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security universe # deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security universe deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security multiverse # deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security multiverse