16.04 is old at this point. I had a similar problem with Ubuntu 22.04, which
should be currently supported, and found a solution on that release. I am using
a fully patched system with nvidia-settings 510.47.03-0ubuntu1. It needs to be
able to write /etc/X11/xorg.conf when running as root when the user requests
it. Attempting to run nvidia-settings as root it cannot write to that
configuration file. The following change fixed this for me: chmod u+x
/usr/share/screen-resolution-extra/nvidia-polkit
Please update the package to implement the equivalent and close this.
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Packages, which is subscribed to nvidia-settings in Ubuntu.
https://bugs.launchpad.net/bugs/1625119
Title:
Nvidia settings can't be saved
Status in nvidia-settings package in Ubuntu:
Confirmed
Bug description:
Ubuntu 16.04 suggest proprietary Nvidia drivers when a Nvidia GPU is
present. The settings in the nvidia-settings tool cannot be saved,
however, without starting the tool as root and doing all kinds of
workarounds which is impossible to do for the average user.
Do you really expect users to reconfigure their displays after every
login?
Unless you can fix this, the Nvidia driver recommendation should
simply be removed. Delivering such a horrible experience to millions
of users seems like a bad joke and the persons responsible should feel
really bad about this.
Ubuntu has no future anywhere with such usability issues.
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