I just upgraded my Maverick to Natty 3 days ago. It's fun and good. I try to be familiar with Unity, but the Natty constantly freezes suddenly. I try another alternative, I use Ubuntu Classic instead of Unity, and at the end my computer continues freezing suddenly and it made me really angry, I can't do anything except of force my computer to shut down through the power button. My laptop is Compaq CQ20 windows & 32bit
Add this to your repositories.
or in the terminal:
or Open the Software Sources menu by going to Applications->Ubuntu Software Center, then selecting Edit->Software Sources. Choose the Other Software tab and click Add.
see if it helps.
Besides Uri answer try this too: enable proposed updates in Software Sources, and update your system to 2.6.38-9 kernel. Maybe this helps.
I have an HP MINI 210 and it freezes like yours, my issue? the wireless card!
the solution: blacklisting the following drivers:
(this should be appended to the file /etc/modprobe.d/blacklist.conf)
then restart and it should be working if this is your issue!
if this doesn't work, don't forget to remove those lines from the file.