Hi, since UBIFS is in mainline now, the mkfs.ubifs utility has been moved to mtd-utils.git repository. Josh, I am not sure how you do this, but could you please tag a new release of mtd-utils and may be make Fedora/Debian update their corresponding rpm/deb? Thanks. -- Best regards, Artem Bityutskiy (Битюцкий Артём)