force unmount /opt

[blueberrycheesecake]

i need to unmount /opt but i keep getting this:

poobah@ds9:~$ sudo umount /opt
umount: /opt: device is busy
umount: /opt: device is busy

so i closed all applications except for the terminal and i still got the same result.

how do i force unmount?

[Kyral]

1) Reccommend that this be moved to one of the Support Forums

2) Is /opt on the same partition as the rest of the / file system? If so then you won't be able to unmount it

[blueberrycheesecake]

thanks kyral!

it's not in the same partition.

i tried to force unmount it again

sudo umount -f /opt

again, it gave me a service is busy reply or something like that
i then rebooted it.
and ... voila! ... /opt is already unmounted after booting.

i don't get it.

[denkedran]

you could have umount withount rebooting with the following

umount -l /opt
man umount (search for lazy)

perhaps with a sudo

[ajoliveira]

that -l option was useful for me, thanks!

[dodo_ur]

"umount -l /opt" it works for me