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can't mount -o remount,ro /usr



I'm having a problem trying to remount /usr read-only. Some process has
a file open for writing on /usr even though nothing I'm running on the
computer should need to open files on /usr for writing (except apt-get
when I tell it to).

My question is how to I find out what process has a file open for
writing on /usr?

I've already google'd and tried lsof, but lsof doesn't show anything
unusual and the documentation doesn't help (I'm probably not using it
right).

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GAT/CM$/CS>$/CC/IT$/M/S/O/U dpu s+:++ !a C++$>C+++$
UB+++>++++$L++++$*-- P+>++$ L+++(++++)$ E-(---) W+++>$ N(+) o? K-
w--(---) O? M V? PS++@ PE-@ Y+@ PGP++(+++)>$ t? 5? X? R tv--(-)
b++(+++)@ DI? D? G e->++++ h* r? z*
------END GEEK CODE BLOCK------

David Mandelberg
webmaster@eth0.is-a-geek.org

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