Thank you for taking the time to report this bug and helping to make
Ubuntu better. Reviewing your dmesg attachment in this bug report it
seems that there is a problem with your hardware. I recommend
performing a back up and then investigating the situation. Measures you
might take include check
** Attachment added: "Df.txt"
https://bugs.launchpad.net/bugs/644701/+attachment/1619941/+files/Df.txt
** Attachment added: "Dmesg.txt"
https://bugs.launchpad.net/bugs/644701/+attachment/1619942/+files/Dmesg.txt
** Attachment added: "DpkgTerminalLog.txt"
https://bugs.launchpad.net/bugs