Description of problem: Fedup creates /var/tmp/fedora-upgrade and /var/lib/fedora-upgrade which is in my case is in /root partition, I only have 2.9G in free space, but I need almost 8G, I think. One time, fedup fails on download with: no free space, after move 4 gigas of download stuff to other partition, I got again other no free space but this time on install phase. So I suggest check if we have free space in double of what rpms we have installed in system, and give an estimation immediately, instead of trying install it with less of half that is need . Version-Release number of selected component: fedup-0.7.3-4.
See also bug #891943
yeah is the same problem *** This bug has been marked as a duplicate of bug 891943 ***