I got it!!
some notes:* got Ubuntu 6.10 amd64 (shouldn't matter)
* built fpc 2.0.4 myself
* built lazarus myself
... blah that's it.
solution:* Go to "Environment" -> Debugger Options
* Choose "GNU debugger (gdb)"
* Path *should* be: /usr/bin/gdb
Now try to execute your programs - worked for me!
Also check your programme's paths and so on.
Wow my first post and I solved a big prob like this

Regards!