Bulletproof approach - disable extras-devel, and extras-testing, 'apt-get update', 'apt-get install --reinstall truecrypt', and - if you still wish to - enable extras-devel and extras-testing, 'apt-get update' again.

Of course, you can also use command to explicitly install set version (refer to apt manual), OR temporarily set extras as a target (manual again), OR use other fancy way to skin this antelope.

Anyway, why do you find GUI non-usable? Also, do You know, that you can still use truecrypt as command-line only (just don't use GUI) - invoke 'truecrypt --help'' for list of supported commands. also, keep in mind, that old version is depreciated, as it got -m nokernelcrypto hardcoded, hurting performance in case of cryptographic module being available.

Of course, it's totally up to You - if You got some masochist tendencies, have fun. Yet, I can't help you with old version, as i've stated in FAQ - it wasn't uploaded by me, and I wasn't using it in any way.

/Estel