Comment 13 for bug 1822937

Running into the same problem:
Ubuntu 19.04
NVIDIA Driver 440.33.01

Output: (Please note that not even writing the conf to my HOME directory works. I've also retried with sudo. Same results.)

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➜ nvidia-settings

(nvidia-settings:19553): GLib-GObject-CRITICAL **: 10:04:11.973: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

WARNING: Unable to parse X.Org version string.

Package xorg-server was not found in the pkg-config search path.
Perhaps you should add the directory containing `xorg-server.pc'
to the PKG_CONFIG_PATH environment variable
No package 'xorg-server' found
Error accessing /usr/share/screen-resolution-extra/nvidia-polkit: No such file or directory

ERROR: Unable to open X config file '/etc/X11/xorg.conf' for writing.

WARNING: Unable to parse X.Org version string.

Package xorg-server was not found in the pkg-config search path.
Perhaps you should add the directory containing `xorg-server.pc'
to the PKG_CONFIG_PATH environment variable
No package 'xorg-server' found
Error accessing /usr/share/screen-resolution-extra/nvidia-polkit: No such file or directory

ERROR: Unable to open X config file '/home/ig/test.conf' for writing.