Looks like a hardware problem (?) after all. I reconnected the sata cables and
everything went back to normal! Solution from:
http://ubuntuforums.org/showthread.php?p=9994345
** Changed in: coreutils (Ubuntu)
Status: New => Invalid
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[md5sum] checksum of dvd images OK, but system becomes unresponsive (high
memory usage)
https://bugs.launchpad.net/bugs/664066
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