install of crunchbang linux crases every time at the end of the install (85-96% installed)

Confirmed on jaunty beta. The traceback is exactly the same one (but use python 2.6 and lines numbers are a little bit different).

Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 232, in <module>
    main()
  File "/usr/lib/ubiquity/bin/ubiquity", line 227, in main
    install(args[0])
  File "/usr/lib/ubiquity/bin/ubiquity", line 68, in install
    ret = wizard.run()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 441, in run
    self.progress_loop()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 913, in progress_loop
    (ret, realtb))
RuntimeError: Install failed with exit code 1
Traceback (most recent call last):
  File "/usr/share/ubiquity/install.py", line 2214, in <module>
    install.run()
  File "/usr/share/ubiquity/install.py", line 431, in run
    self.configure_hardware()
  File "/usr/share/ubiquity/install.py", line 1387, in configure_hardware
    self.set_debconf('popularity-contest/participate', participate)
  File "/usr/share/ubiquity/install.py", line 2186, in set_debconf
    dc = debconf.Debconf(read=dccomm.stdout, write=dccomm.stdin)
  File "/usr/lib/python2.6/dist-packages/debconf.py", line 53, in __init__
    self.setUp(title)
  File "/usr/lib/python2.6/dist-packages/debconf.py", line 56, in setUp
    self.version = self.version(2)
  File "/usr/lib/python2.6/dist-packages/debconf.py", line 65, in <lambda>
    lambda *args, **kw: self.command(command, *args, **kw))
  File "/usr/lib/python2.6/dist-packages/debconf.py", line 86, in command
    status = int(status)
ValueError: invalid literal for int() with base 10:

I found something very strange with mount command :

While ubiquity was copying files on the target, only sda10 was mount, whereas when the bug occured, there was more partitions:
/dev/sda10 on /target type ext4 (rw,relatime,errors=remount-ro)
/dev/sda5 on /target type ext3 (rw)
/dev/sda7 on /target/home type ext3 (rw)

The fact is that /target/etc/popularity-contest.conf doesn't exist in sda5 but exist in sda10. and that's exactly where Ubiquity crashed (apport title is "ubiquity crashed with ValueError in command()").

I founded a workarounded : just unmount the unneded partitions in the following loop :
while true; do sudo umount /dev/sda7; sudo umount /dev/sda5 ; done

This allows to finish the install with success.

Closing since crunchbang is not ubuntu.