Maybe INITRD fault ? http://lists.opensuse.org/opensuse-bugs/2013-11/msg01652.html
it is not ubuntu specific, and not new : https://www.google.fr/?gfe_rd=cr&ei=dJRkU7qcGov10gXrk4DIDw&gws_rd=ssl#q=ufs:+You+didn%27t+specify+the+type+of+your+ufs+filesystem
Maybe INITRD fault ? http:// lists.opensuse. org/opensuse- bugs/2013- 11/msg01652. html
it is not ubuntu specific, and not new : https:/ /www.google. fr/?gfe_ rd=cr&ei= dJRkU7qcGov10gX rk4DIDw& gws_rd= ssl#q=ufs: +You+didn% 27t+specify+ the+type+ of+your+ ufs+filesystem