运行 21.04 一段时间后，昨天的一次错误升级毁了我的桌面，包括 nvidia 驱动程序，尽管已经添加了，但还是无法再次安装它们电力购买协议。
✦ ❯ sudo apt-get update
Hit:1 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu hirsute InRelease
Hit:2 http://nl.archive.ubuntu.com/ubuntu hirsute InRelease
Hit:3 http://ppa.launchpad.net/shutter/ppa/ubuntu hirsute InRelease
Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:5 http://nl.archive.ubuntu.com/ubuntu hirsute-updates InRelease
Hit:6 https://updates.signal.org/desktop/apt xenial InRelease
Hit:7 http://nl.archive.ubuntu.com/ubuntu hirsute-backports InRelease
Hit:8 https://packages.microsoft.com/ubuntu/21.04/prod hirsute InRelease
Get:9 http://security.ubuntu.com/ubuntu hirsute-security InRelease [110 kB]
Hit:10 http://prerelease.keybase.io/deb stable InRelease
Hit:11 http://security.ubuntu.com/ubuntu focal-security InRelease
Fetched 110 kB in 1s (137 kB/s)
Reading package lists... Done
~
✦ ❯ apt policy nvidia-graphics-drivers-470
N: Unable to locate package nvidia-graphics-drivers-470
~
✦ ❯
可能出了什么问题？