I have rubymine 2.0 (bulid 91.15) on ubuntu 9.10 and it works fine.
I tried using rubymine 2.0.2 (build 93.202) but when trying to debug with it I get the following error:
Cannot connect to debugged process at port <some_port> in 10s:
/usr/lin/ruby/gems/1.8/gems/ruby-debug-ide-0.4.2/bin/rdebug-ide:21: uninitialized constant Debugger (NameError)
I tried using the soultion in http://www.jetbrains.net/devnet/message/5262683?tstart=0, but I get the following error:
error installing ruby-debug-ide-0.4.9.gem
ERROR: Failed to build gem native extension.
/usr/bin/ruby1.8 mkrf_config.rb install -l ruby-debug-ide-0.4.9.gem
ERROR: http://gems.rubyforge.org/ does not appear to be a repository