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After installing Fedora-15-Alpha-x86_64-Live-Desktop.iso I noticed that /mnt wasn't an empty dir, as expected; instead it was full of duplicate mountpoints from /etc/fstab. e.g.: I told the installer to mount my old rootfs at /mnt/rootf14, and it was, but there was also an (unmounted) dupe at /mnt/mnt/rootf14 (and a /mnt/boot, /mnt/home, etc). Messy.
What does your /etc/fstab look like? It would also help to attach the install logs from /var/log/anaconda/* (as individual text/plain files).
Created attachment 483590 [details] /etc/fstab
Created attachment 483591 [details] /var/log/anaconda/anaconda.log
Created attachment 483592 [details] /var/log/anaconda/anaconda.program.log
Created attachment 483593 [details] /var/log/anaconda/anaconda.storage.log
This will be fixed in the next build for rawhide (16.3)