Comment 5 for bug 649917

This warning seems to be caused by the label control for plymouth, which uses pango to render text.

We should be able to suppress the warning simply by generating a bogus /etc/passwd file in the initrd with an entry for root, such that glib finds a valid user entry for uid 0.

Patch to do this attached; it's currently building in my PPA (https://launchpad.net/~broder/+archive/ubuntu-tests), and should be tested to confirm it eliminates the problem.