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I did software update from the GUI pop-up notification - updated everything suggested except nvidia drivers (I had nvidia-375 installed, my GPU is nvidia Geforce 920M), and nvidia opencl libs.

After reboot it threw me that

The system is running in low graphics mode

So as I thought nvidia drivers should be also updated (to 378, or 384), because Xorg would require fresh nvidia libs - I did remove the current nvidia driver, then installed newer ones (378 then 384) but that didn't changed anything ...

Restarting lightdm not showing unity log-in gui, instead in the terminal I'm getting this: 

No suitable _DSM call found

(also was getting this error during each boot with nvidia-settings and nvidia-prime installed, and was NOT getting when these packages are not installed)

As an additional info I have a nouveau driver blacklisted as so in /etc/modprobe.d/blacklist.conf

blacklist nouveau

Also in the Xorg.0.log I can see the following

Fatal server error:
    [26.673] (EE) no screens found(EE)

Is this issue related to lightdm???

What's the root of the problem?

How to fix this?

Zanna
  • 70,465
ampawd
  • 101
  • Disable Secure Boot at UEFI. –  Sep 25 '17 at 20:20
  • @MichaelBay its been disabled ... – ampawd Sep 25 '17 at 20:30
  • What happens if you comment out blacklist nouveau in /etc/modprobe.d/blacklist.conf – Elder Geek Sep 25 '17 at 20:37
  • @ElderGeek I commented it out, same thing happened, nothing changed – ampawd Sep 25 '17 at 20:43
  • Mabny have found this useful perhaps you will as well. Unless of course it's a bug. Are you running bumblebee? – Elder Geek Sep 25 '17 at 20:46
  • @ElderGeek Im not running bumblebee, was running nvidia-prime, but i uninstalled it to localize the issue – ampawd Sep 25 '17 at 21:01
  • bumblebee has some related bugs called against it which is why I asked. Did you just remove the nvidia driver or did you purge it? – Elder Geek Sep 25 '17 at 21:06
  • @ElderGeek yeah did I purge it, I ran this command - apt-get remove --purge nvidia* – ampawd Sep 25 '17 at 21:08
  • The root of the problem is whatever non-Ubuntu packages caused the 'partial software update'. Solve that first, then complete the upgrade, then see if graphics drivers are still a problem at all. – user535733 Sep 26 '17 at 17:10
  • Here is our attempt to fix this, https://askubuntu.com/questions/957392/login-loop-when-any-nvidia-driver-installed-ubuntu-16-04-3-unity-lightdm Hmm, I find that this page is not search engine optimized – Bossliaw Nov 03 '17 at 04:18

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