I installed or upgraded to Ubuntu 16.04, but I'm having some problems with my graphics card.
- The display is blank
- The display flickers
- Items on the screen do not display correctly
- Certain programs complain of graphics issues
The computer boots to low-graphics mode
Your specific issue may not be here, but try the solutions described in the answers anyway.
This question is very broad, but each one of these issues likely has one solution.
If you are experiencing a login loop, check the last part of my answer.
If you experience one of the listed issues and have your own solution (mine didn't work, or there's a faster way), feel free to post another POLITE answer, describing your problem and how you fixed it.
Those attempting to install Ubuntu, please refer to the section titled:
If you are unable to enter a TTY or are trying to install Ubuntu.