apt-get problem: /usr not in fstab

[trapstep <trapstep@gmx.net>]

Hi!

i tried to update some packages (kde) with apt-get. apt fetched the files
without probs (except that it said: lockd: failed to monitor 192.168.1.1) but
when it tries to install them, i get the following output:

Fetched 2715kb in 6m26s (7030b/s)
mount: can't find /usr in /etc/fstab or /etc/mtab
W: Not using locking for nfs mounted lock file /big/cache/apt/archives/lock
E: Problem executing scripts DPkg::Pre-Invoke 'mount -o remount,rw /usr'
E: Sub-process returned an error code

i don't even understand why apt/dpkg wants to remount sth thats isn't mounted,
for me, it seems like a bug in dpkg 
BTW i'm using apt0.3.6 and dpkg1.4.1.1 on a potato distro

TIA
	trapstep
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