Im having problem running Ubuntu 15.04. After startup I see artifacts on the screen like triangles and shroud. Then few minutes later the screen goes black.
With Ubuntu 14.04 i was unable to run it at all. Also it failed with Mint linux.
All works fine with Windows so I guess its not hardware issue.
Any help appreciated.
(Re) install the NVIDIA drivers, but first uninstall all NVIDIA software you had installed before.
Open a terminal and execute:
sudo apt-get purge nvidia*
sudo reboot
When the GRUB boot menu appears : Highlight the Ubuntu menu entry and press the "e" key.
Add the nouveau.modeset=0 parameter to the end of the linux line ... Then press F10 to boot.
Install the stable NVIDIA drivers from the Ubuntu repositories :
sudo apt-get update
sudo apt-get install nvidia-340
sudo reboot
In case you are using a notebook with hybrid graphics solution install Optimus support as well.
sudo apt-get install nvidia-prime
So basically what @cl-netbox said is correct, thus the answer is accepted. But in many cases there may be more things to consider. First at all is the fact that I was unable to start installation at all. After running from the LiveCD - no matter if I chose to start installation or to try the Ubuntu - I got the black screen after a while so I was unable to install Ubuntu this way.
The solution to this was to get to the pre-launch menu. To do so you need to press any key when the Ubuntu starts booting, while on the purple screen with a keyboard icon.
When the menu appeared I had to highlight the "Try Ubuntu without installing" option and press F6 and the "ESC". This way the boot options line showed on the bottom of the screen - now I needed to delete the ending three "---" and append the "noveau.modeset=0" text to it, and press enter in order to start the Ubuntu form LiveCD. This allowed me to install Ubuntu later by clicking the "install Ubuntu" icon on the desktop.
After the installation was done I had to reboot and do the steps described by @cl-netbox but a little different. I've needed to start the now installed Ubuntu system with the "nouveau.modeset=0" still intact, because otherwise the system would hang while trying to uninstall existing drivers. So I've highlihted the Ubuntu entry and pressed "e" and appended the "nouveau.modeset=0" to the end of the line starting with "linux" word, pressed F10 and the system has boot.
Then I've issued the:
sudo apt-get purge nvidia*
sudo reboot
..commands in the terminal. At this point the console told me that no drivers were installed (this may probably vary between Ubuntu versions) so I've immediately issued commands to install the new drivers:
sudo apt-get update
sudo apt-get install nvidia-340
sudo reboot
After reboot the system was all fine and working well.
As a side note I would like to say that I think the problem with nouveau drivers is that they probably overheat the GPU. Before I've fixed the problem the situation looked like following: Every time , after the screen went black, during the reboot - I could hear the GPU fan working at maximum speed for a few seconds. This could be verified by taking actuall measurements, but if this really the case - the issue is not only a problem on itself but also a threat for the underlying hardware.