[ubuntu] Issues with ubuntu 12.04 on dell inspiron 1545

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http://ubuntuforums.org – Hey all, I'm new here :P I've got two computers with a fresh install of Ubuntu 12.04: - Acer Aspire One D270 netbook, Intel Atom processor, 2 gb ram - Dell Inspiron 1545 notebook, Intel Core 2 duo processor, 3 gb ram And I've got the EXACT same issues on both: - every minute or so, the screen freezes for 3 or 4 seconds. I'm not able to do anything, and everything on the screen stays still. I'm only able to move the cursor, but nothing happens when I click on things. - booting takes a long time compared to the times when I had ubuntu 10.10 - firefox freezes very randomly, the screen turns grey (Hardware)