[ubuntu] 12.04 hard disk errors

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http://ubuntuforums.org – since a couple of days I get some "system errors" and yesterday even a lockup of the system. No choice than to rest. A couple of times I had to try to reboot till it finally is there again. However, it asked me to "agree" to the Tos of Skype, before I can use it, ... seems that is gone. I want to do a fsck but it responds: Quote: fsck from util-linux 2.20.1 e2fsck 1.42 (29-Nov-2011) /dev/sda2 is mounted. WARNING!!! The filesystem is mounted. If you continue you ***WILL*** cause ***SEVERE*** filesystem damage. Do you rea (Hardware)