Just have a time to upgrade my desktop to 11.04 after reboot i get black screen. ebbr.bugs from ubuntuforums said this bcoz nvidia driver was intstalled as a package not a drivers. so this two commands will help sudo apt-get install --reinstall linux-headers-'uname -r' sudo apt-get install --reinstall linux-image-'uname -r' and it fix my problem :)
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