Comment 7 for bug 66505

Oct 17 03:40:56 ubuntu kernel: [4296462.600000] SQUASHFS error: zlib_fs returned unexpected result 0xfffffffd
Oct 17 03:40:56 ubuntu kernel: [4296462.600000] SQUASHFS error: Unable to read fragment cache block [3302326]
Oct 17 03:40:56 ubuntu kernel: [4296462.600000] SQUASHFS error: Unable to read page, block 3302326, size 60f0
Oct 17 03:53:08 ubuntu -- MARK --

I am NOT the expert here, but I did see Colin say in similar situation:
"Thanks for your report. This particular error is often due to a faulty
CD/DVD disk or drive. It may help to clean the CD/DVD, to burn the
CD/DVD at a lower speed, or to clean the CD/DVD drive lens (cleaning
kits are often available from electronics suppliers)."
But you should wait the opinion of the expert.