When trying to dismount an encrypted partition i get the ol'
Error: device-mapper: remove ioctl failed: Device or resource busy. The recommended solution from the interwebz seems to be to change some truecrypt settings to not use kernel cryptographic services.
This would be easy to try, if it weren't for the fact that the system has precisely no window managers installed.
Is there a way to change the truecrypt setting "Do not use kernel cryptographic services" from the terminal?