string-escape is a built-in codec in Python, so this traceback made me
suspicious that it was a lower-level problem.  Sure enough, there's lots
of this kind of thing in your syslog:

Feb  2 16:36:41 ubuntu kernel: [  164.136790] SQUASHFS error: 
squashfs_read_data failed to read block 0x27ba812e
Feb  2 16:36:41 ubuntu kernel: [  164.136810] SQUASHFS error: Unable to read 
data cache entry [27ba812e]
Feb  2 16:36:41 ubuntu kernel: [  164.136816] SQUASHFS error: Unable to read 
page, block 27ba812e, size ec41

This indicates that there's been a problem reading from the CD.  This is
generally due to a faulty CD/DVD disk or drive, rather than being an
installer bug as such (indeed, the installer can do very little about
it).  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).

** Changed in: ubiquity (Ubuntu)
       Status: Incomplete => Invalid

-- 
install failed
https://bugs.launchpad.net/bugs/515645
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