Problems/issues with Ubuntu/Trisquel

Hi everyone,

I know this is a forum for Trisquel GNU/Linux, but I was just wandering if anyone is having the same issues I'm having with Ubuntu 10.04, with Trisquel GNU/Linux I mean.

I have been experiencing crashes with my Ubuntu instalation.
After a few hours the screen(Gnome), just freezes, sometimes the screen turn black with a white cursor(cursor is not blinking), doesn't let me do anything, I can't go through tty1 to tty6, sometimes the screen just turns black and reboots!!

I've tried several solutions, but nothing did the trick.
I've already reported the problem, it seems it's a bug with the ATI driver.

I have an ATI Radeon 9250 AGP(I'm using the open source driver), an ASUS K8U-X motherboard with an AMD Sempron CPU.

Has anyone experienced the same problem(s) with Trisquel GNU/Linux 2.2.2 / 3.5 or the upcoming release 4.0?

Has anyone found a solution?

Thank you very much,