Hi Todd,
/usr holds almost all active binaries (/usr/bin) and libraries
(/usr/kib), you will not be able to umount it.
First step of "remount" is a umount.
cheers
Todd A. Jacobs wrote:
> I have the following in /etc/apt/apt.conf:
>
> Dpkg::Pre-Invoke {"/bin/mount -o remount,rw /usr";};
> Dpkg::Post-Invoke {"/bin/mount -o remount,ro /usr";};
>
> However, in many cases, running aptitude results in the following error:
>
> mount: /usr is busy
> E: Problem executing scripts DPkg::Post-Invoke '/bin/mount -o remount,ro
> /usr'
> E: Sub-process returned an error code
>
> I can't figure out why aptitude is leaving the partition in a state
> where it can't be remounted ro, even after a significant amount of time
> has passed or /bin/sync has been called.
>
> Running "fuser -vm /usr" reveals that /usr/lib/iceweasel/firefox-bin is
> being left open for writing (why???), but even after closing firefox and
> seeing /usr/lib/iceweasel/firefox-bin disappear from the fuser output,
> the problem remains the same.
>
> How do I work around this issue, or at the very least find out why the
> filesystem is being held open?
>
>
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