Ubuntu 12.04 freezing at login
I have Ubuntu 12.04 dual booted on a Acer Aspire 5250, and sometimes when I start up the laptop and choose ubuntu it will load until the login screen and completely freeze. This doesn't happen every time I start up the laptop, this is only the second time it has happened. When it happened before it just started working after a while, I have no idea what is causing it or how I fixed it before. Can anyone help me out ?