Comment 1 for bug 1829639

After review the casper script I was find where is the issue

casper.log:
Begin: Copying live_media to ram ... mount -t tmpfs -o size=796456k /dev/shm /cdrom_swap
done.
umount: can't unmount /isodevice: Device or resource busy
Warning: Unable to find the persistent medium

The resource is busy because the iso file still mounted to loop device. The umount is at line 198