经过一些更新后，我的屏幕分辨率为 640x480（甚至更低），并且没有选项可以更改它。我不知道我到底更新了什么，我记得我已经安装了linuxbrew-wrapper。当我打开“设置/设备/显示”时，有未知的显示，没有分辨率选项。我的配置：Ubuntu 18.04.5 LTS GeForce GTX 750 Ti 我有 3 个屏幕 DVI 连接我试过：
sudo apt-get purge 'nvidia*'
sudo add-apt-repository ppa:graphics-drivers
sudo apt-get update
然后
sudo add-apt-repository ppa:graphics-drivers/ppa
但此命令以
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
nvidia-driver-455 : Depends: libnvidia-gl-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: libnvidia-compute-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: libnvidia-extra-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: nvidia-compute-utils-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: libnvidia-decode-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: libnvidia-encode-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: nvidia-utils-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: xserver-xorg-video-nvidia-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: libnvidia-cfg1-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: libnvidia-ifr1-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Depends: libnvidia-fbc1-455 (= 455.45.01-0ubuntu0~0.18.04.1) but it is not going to be installed
Recommends: libnvidia-compute-455:i386 (= 455.45.01-0ubuntu0~0.18.04.1)
Recommends: libnvidia-decode-455:i386 (= 455.45.01-0ubuntu0~0.18.04.1)
Recommends: libnvidia-encode-455:i386 (= 455.45.01-0ubuntu0~0.18.04.1)
Recommends: libnvidia-ifr1-455:i386 (= 455.45.01-0ubuntu0~0.18.04.1)
Recommends: libnvidia-fbc1-455:i386 (= 455.45.01-0ubuntu0~0.18.04.1)
Recommends: libnvidia-gl-455:i386 (= 455.45.01-0ubuntu0~0.18.04.1)
E: Unable to correct problems, you have held broken packages.
答案1
一周后，nvidia 驱动程序有了新的更新。安装后问题解决。