I own a Dell XPS 15 laptop with both an integrated Intel HD graphics gpu and a Nvidia 1050M.
After installing Ubuntu 18.04 and nvidia-driver-396 I've been suggested to disable the Nvidia GPU to avoid some fan problems happening on Ubuntu, and I did so from nvidia-setting, but I haven't been able to enable the nvidia gpu again since then.
Prime-select nvidia executes correctly but the system keeps using the intel gpu, and nvidia-settings does not load anymore because nvidia drivers are not loaded. Selecting Xorg drivers to use with the 1050 from Ubuntu software (instead of nvidia-drivers-396) stops the drivers not loaded error from happening, but nvidia-setting command still outputs
ERROR: Unable to load info from any available system
The system is currently stuck using the i915 driver, and I haven't been able to find a working solution anywhere online.
I already tried reinstalling the nvidia drivers and deleting /etc/X11/Xorg.conf* files.