Hi I downloaded Fedora and Ubuntu Cloud images from their websites. I created 20 GB Cinder Volume named "test1" using Fedora image. I launched Fedora instance with with "test1" as a Root Disk. Then I tried to rebuild instance from Horizon with Ubuntu Image. It rebuilded that successfuly. However when I reboot instance still it boots in Fedora.

Am I missing any steps here? Please help.