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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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 '/usr/share/gnome/help/musicvideophotos/bn/music.xml': Erro de entrada/saída -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs