'PRIME Profiles' tab missing in NVIDIA X Server Settings (Ubuntu 16.04)

Question

I have nvidia-settings and nvidia-prime installed, but the 'PRIME Profiles' tab is missing.

How can I fix it to be able to switch between my GPUs?

Update:

~$ lspci -k | grep -EA2 'VGA|3D'
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
    Subsystem: Hewlett-Packard Company 4th Gen Core Processor Integrated Graphics Controller
    Kernel driver in use: i915
--
01:00.0 3D controller: NVIDIA Corporation GK208M [GeForce GT 740M] (rev a1)
    Subsystem: Hewlett-Packard Company GK208M [GeForce GT 740M]
    Kernel driver in use: nouveau

Solution

Install nvidia-361 in terminal or in GUI, reboot, and PRIME will appear.

It works only with NVIDIA proprietary drivers.

Comments

[Pilot6]

Please edit your question and add output of lspci -k | grep -EA2 'VGA|3D' terminal command.

[Pilot6]

You did not install Nvidia drivers, that is why PRIME does not work. Obvious.

[0lesya]

Switched to Nvidia drivers and restarted... the tab finally appeared after the second 'cycle' of reinstalling PRIME + switching between drivers + rebooting. Not sure why it didn't the very first time, as I'm absolutely sure that I had Nvidia drivers running at the time. + Not sure if the things are connected, but after my first reboot with 'PRIME Profiles' tab present, logging in took longer and a message about an internal error appeared. (ExecutablePath: /usr/lib/unity-settings-daemon/unity-settings-daemon). When I rebooted again to check if it's a constant issue, I had no such problem.

[lurix66]

See a similar question, for a slightly different case, with nvidia-driver-440 installed, not yet solved.