installation crash

raceback (most recent call last):
  File "/usr/bin/ubiquity", line 130, in ?
    install(sys.argv[1])
  File "/usr/bin/ubiquity", line 55, in install
    ret = wizard.run()
  File "/usr/lib/python2.4/site-packages/ubiquity/frontend/gtkui.py", line 264, in run
    self.progress_loop()
  File "/usr/lib/python2.4/site-packages/ubiquity/frontend/gtkui.py", line 553, in progress_loop
    raise RuntimeError, ("Install failed with exit code %s; see "
RuntimeError: Install failed with exit code -11; see /var/log/installer/syslog and /var/log/syslog

Did you run the media check on the CD you burned? The logs look like it might be a bad CD (all the squashfs errors indicate difficulty reading from the disk).

Exit code -11 is a segmentation fault; the only real way that can happen in this particular context is (as David said) if 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. 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).