This question already has answers here: What should I do when Ubuntu freezes? (45 answers) Closed 6 years ago .

About 2 out of 3 times I power on my computer, Ubuntu 14.04 freezes when loading some stage of the login (lightDM) screen. I have to manually power off my computer.

Also, when I go to restart or shutdown my computer from the menu, it just stalls on the Ubuntu screen with the four orange to white dots underneath it for all of time, or on a black screen, and I have to manually power off my computer. I thought perhaps this was an issue with the upgrade I did from 13.10 to 14.04 so I re-installed 14.04 over again from a bootable USB. Problem still persists. I am very new to Ubuntu, and don't really know what I'm doing/looking for with any kind of bug fixes, so any help is greatly appreciated!