Thanks for the bug report. The space is unavailable due to the restriction on the number of primary partitions to 4. You need to delete an existing partition, create an extended partition, and put logical partitions inside it.
** Changed in: gnome-system-tools (Ubuntu) Status: Unconfirmed => Rejected -- Problem with resizing partitions https://launchpad.net/bugs/49423 -- ubuntu-bugs mailing list [EMAIL PROTECTED] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs