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With a recent package and kernel update truecrypt refuses to unmount drives with

device-mapper: remove ioctl failed: Device or resource busy Command failed

(worked fine before) Ubuntu 10.10
I use the lastest version 7.0a of truecrypt and even build the binary but without change.

Any ideas ?

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Hi, I did what the 1st answer( By John) asked to do. But still the problem is not solved.Still I can't unmount the mounted TrueCrypt volum. I'm using TrueCrypt 7.0a in Ubuntu 10.10. It was working fine until I install the recent updates of Ubuntu. Please help me. – user72199 Feb 25 '11 at 14:31
I usually get that error if something is accessing the drive. i.e transmission-bt is running. Any chance the update started something that's accessing your drive? – Brian Feb 25 '11 at 15:30
up vote 1 down vote accepted

To fix this, do the following in the TrueCrypt GUI in Ubunto:

Go to Setting > Preferences > System Integration > Kernel Services and check the box "Do not use kernel cryptographic services"

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As a workaround, you can unmount from command line:

sudo umount /media/truecrypt8

Then dismount it from TrueCrypt GUI.

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protected by sysadmin1138 Mar 4 '11 at 22:11

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