If there is more space free in a partition that could be resized than is
available in unallocated space, then the unallocated-space option is
dropped.  I'm guessing that the theory here may be that you can just use
the "Install alongside" option and leave the other OS' size unchanged,
thereby reducing the number of automatic partitioning options we need to
present.  However, the "Install alongside" option doesn't actually let
you use unallocated space - it always resizes.  I think we should
present unallocated space, as people may well prefer not to reduce the
amount of space available to their other OS.

Another problem I notice is that if the only other partitions present
are data partitions - that is, os-prober outputs nothing - then you get
neither the unallocated-space option nor the resize option.  This seems
like a bug, as resizing is perfectly possible here.  Perhaps the 'if
os_count == 0:' branch in calculate_autopartitioning_options needs to
consider resize options.

I'll ask Evan to comment on this, and reopen or spin off a new bug
report as necessary.

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https://bugs.launchpad.net/bugs/652852

Title:
  Ubiquity doesn't suggest to install on unallocated free space

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