Ubuntu: After installing nvidia drivers, many graphical applications won't launch


I'm using Ubuntu Mate 17.04 on a Dell Inspiron 7559 (skylake i5 and gtx 960m)

After installing Nvidia drivers, Steam and OBS (so far) won't launch and I get this errors:

  • Steam:

    Steam Error OpenGL GLX extension not supported by display   
  • OBS:

    Failed to initialize video. Your GPU may not be supported,  or your graphics drivers may need to be updated.  


In additional drivers, it says that I'm using the nvidia drivers:


However, I'm not sure why I got 3 different nvidia drivers available, 375, 378 and 381. I've must have installed them wrong. I did tried to install them several times,

However the output of lspci | grep VGA" says:

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)  

It seems that I'm using intel GPU. My Nvidia gpu works, I've used it under Windows, also lspci | grep NVIDIA says 02:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2) so it is recognized.

Is bumblebee still necessary? What can I do? , I've tried sudo apt purge nvidia* and then reinstalled with sudo apt install nvidia-current but nothing different happened

EDIT: Secure Boot was disabled since I installed Ubuntu Mate and still is.

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