unknown user: root

[Andy Green]

...
> open("/etc/passwd", O_RDONLY)           = 3
> fcntl64(3, F_GETFD)                     = 0
> fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0

So far so good.  But on my system now it reads from /etc/passwd and 
remains happy.  On your system instead it decides to look in here:

> open("/etc/default/nss", O_RDONLY)      = 4

This file is something to do with NIS auth.  Are you set up for NIS auth 
to your knowledge?

-Andy
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