I have also the same problem. With two monitors, I change the monitor positions (left/right) in the nvidia-settings tool (started with sudo) and write it to the X Configuration file (/etc/X11/xorg.conf). The file is changed, but the monitor positions are reset after next reboot.
I wondered why there is only one Monitor section in the xorg.conf file, but the gui of nvidia-settings mentions two monitors (one connected per DVI, one per DP at my Geforce GTX 1060). I can confirm that the "Package xorg-server was not found " error vanished after installing xserver-xorg-dev, but the following error is still present: thomas@deepthought2:~$ sudo /usr/bin/nvidia-settings (nvidia-settings:7845): GLib-GObject-CRITICAL **: 09:17:21.642: g_object_unref: assertion 'G_IS_OBJECT (object)' failed ** Message: 09:17:21.764: PRIME: No offloading required. Abort ** Message: 09:17:21.764: PRIME: is it supported? no My setup: Ubuntu 20.04 Nvidia 450.80.02 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to nvidia-settings in Ubuntu. https://bugs.launchpad.net/bugs/1822937 Title: NVIDIA settings won't write to /etc/xorg Status in nvidia-settings package in Ubuntu: Fix Released Status in nvidia-settings source package in Disco: Won't Fix Bug description: I tried running it with root (`sudo nvidia-settings`) and without. I also generated an xorg file with `nvidia-xconfig`, and do the same thing, but it still won't work. ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: nvidia-settings 418.56-0ubuntu1 ProcVersionSignature: Ubuntu 5.0.0-8.9-generic 5.0.1 Uname: Linux 5.0.0-8-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.10-0ubuntu23 Architecture: amd64 CurrentDesktop: KDE Date: Wed Apr 3 00:33:48 2019 InstallationDate: Installed on 2019-04-02 (0 days ago) InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190326.1) SourcePackage: nvidia-settings UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-settings/+bug/1822937/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp