I think you have media problems judging from the number of CDROM errors
I see in https://bugs.launchpad.net/ubuntu/+source/initramfs-
tools/+bug/688898/+attachment/1762525/+files/Dmesg.txt
** Changed in: initramfs-tools (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/688898
Title:
package linux-backports-modules-compat-wireless-2.6.35-2.6.32-25-generic-pae
2.6.32-25.24 failed to install/upgrade: subprocess installed post-removal
script returned error exit status 1
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