我试图安装一个 deb 软件包，但由于依赖项而拒绝运行，在尝试安装依赖项或操作系统更新失败后，我卸载了 deb 软件包。由于有许多待处理的更新，我尝试运行这些更新，但源网址报告未找到。
服务器：ubuntu 21.04
apt update
Hit:1 https://deb.nodesource.com/node_14.x hirsute InRelease
Hit:2 https://dl.yarnpkg.com/debian stable InRelease
Ign:3 http://us.archive.ubuntu.com/ubuntu hirsute InRelease
Ign:4 http://us.archive.ubuntu.com/ubuntu hirsute-updates InRelease
Ign:5 http://us.archive.ubuntu.com/ubuntu hirsute-backports InRelease
Ign:6 http://us.archive.ubuntu.com/ubuntu hirsute-security InRelease
Err:7 http://us.archive.ubuntu.com/ubuntu hirsute Release
404 Not Found [IP: 91.189.91.38 80]
Err:8 http://us.archive.ubuntu.com/ubuntu hirsute-updates Release
404 Not Found [IP: 91.189.91.38 80]
Err:9 http://us.archive.ubuntu.com/ubuntu hirsute-backports Release
404 Not Found [IP: 91.189.91.38 80]
Err:10 http://us.archive.ubuntu.com/ubuntu hirsute-security Release
404 Not Found [IP: 91.189.91.38 80]
Reading package lists... Done
E: The repository …