I hit the bug tonight which left my system unbootable.

Sequence to trigger the bug:

Note:  This requires a working install of linux with grub and windows
already.

1.  Install debian testing netinstall via unetbootin on a usb stick.

2.  Install ubuntu via unetbootin on the same usb stick without
reformatting.

3.  Install Ubuntu, while reformatting the partitions

4.  The error pops up stopping the install

5.  Reboot, and watch grub enter rescue mode.


There are two bugs:

1.  Unetbootin is broken

2.  Ubiquity leaves the system in a useless state so it can't be
rebooted even if there's another bootable partition (in my case Win7) on
it.

How to fix it:

1.  File a bug report upstream to Unetbootin

2.  Ubiquity can detect the bug and fail early.  It fails already, just
make it fail before the drives get reformatted.  :)


If I reboot the machine right now, grub is borked, and I get the joy of booting 
windows by typing in grub commands somehow.  I don't see this being a good 
thing for the end user.

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https://bugs.launchpad.net/bugs/1024827

Title:
  Ubuntu installer crash can't overwrite compose.ARMSCII-8.inc

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