dmesg.txt is showing a bunch of errors from your hard disk which appear
to be a hardware error. It looks like there is a problem with your hard
disk. I don't think this is a software problem, so I'm closing the bug.
** Changed in: ubuntu-docs (Ubuntu)
Status: New = Invalid
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https://bugs.launchpad.net/bugs/784166
Title:
package ubuntu-docs 11.04.2 failed to install/upgrade: falhou ao
executar stat (dereference) para ligação simbólica existente