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12.04 with latest updates freezes every time on Acer Aspire One 722

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http://askubuntu.com – I installed 12.04 32 bit, Italian language, from scratch, with the then-current updates some weeks ago on an Acer Aspire One 722 with Atheros wifi. I'm not using any proprietary driver. It worked fine till 4 days ago. Then it began to freeze occasionally. I tried to install the new updates but now it is freezing every time i use it. It usually happens during the login, or when connecting wifi or asking for super user password. When I updated last time the packages got installed, then the computer rebooted and freezed. I have no previous experience with any Linux distro. I'll be happy to prov (HowTos)