time-to-time I see on various forums questions about TSM client for Debian. IBM itself do not consider Debian being a supported platform, so they do not even plan to create the package. You can find several HOWTO's (mostly created using "alien" package converter) on the web, or you can install rpm and try to solve dependencies on your own.
As our environment is 95%+ Debian based, we created our own .deb package(s). We unpacked the rpm's (both API and BA), created new postinst scripts, sample configs etc. and packed it up in a single package.
Originaly we intended to use them for internal purposes only, but we think someone might find it usefull.
You can find the packages on http://www.adsm.org website - download section
1) Package is not an official IBM release, Debian is not supported - use at your own risk
2) read the README ... really .....
3) if you have comment/suggestion/improvement - let me know