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My Ubuntu version is 14.04 4.4.0-81-generic, laptop is Dell Inspiron 3558 with Nvidia video card GeForce-920M and integrated Intel HDGraphics. I have spent a huge amount of time trying to find a way to switch between graphic cards.

I tried installing Bumblebee and different (suggested by ppa:graphics repository (390, 384 and 387 versions)) Nvidia drivers and everytime it ends up with "low graphics mode" screen when I switch to Nvidia card.

By the way, binary Nvidia drivers gave black screen while installing drivers from *.run source files from Nvidia website Ubuntu gets stuck in a login loop (i.e. when I log in, then it logs out immediately). I haven't found an appropriate solution of my issue on the Internet.

What else can I do?

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    Why are you using a 4 years old release? – user692175 Jan 19 '18 at 20:11
  • Because I use ROS Indigo which is compatible only with 14.04 – Genux Jan 19 '18 at 21:08
  • And why are you using Indigo when you could be using Lunar? Just a curiosity because you aren't the first one in that self-inflicted catch22. What's so special about the Indigo release? – user692175 Jan 19 '18 at 21:15
  • I have just started completing my bachelor's degree and previous part of project is using ROS Indigo. I didn't try to build driver packages on later distributions of ROS: maybe they won't even be built. – Genux Jan 19 '18 at 21:30
  • Not really. It's supposed to be compatible. Besides, Indigo has problems of its own with just normal updates within 14.04: wiki.ros.org/indigo/Installation/Ubuntu#Installation-1 – user692175 Jan 19 '18 at 21:35
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There is a useful link where driver's versions with graphics cards are written which I occationnally found on the Internet

https://nvidia.custhelp.com/app/answers/detail/a_id/3142 (Support timeframes for Unix legacy GPU releases)

The only key to solve this issue was to find and install an appropriate driver(I have understood this because previously I found good nvidia-361 driver and one day it didn't work(maybe after updating ) so I removed it) Using this link, I realised that for my videocard nvidia-340 driver is recommended. However, this wasn't mentioned in additional drivers application or using command:

sudo ubuntu-drivers devices

So I just typed

sudo apt-get install nvidia-340

and everything became fine( now I am able to switch between graphic cards )!!

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