With Linux, it is not as straightforward. Most 64-bit Linux distributions do not include the 32-bit compatibility layer by default, which means Real Studio or apps created with it will not work.
The way to fix this varies from distribution to distribution, so it's a challenge for us to be able to provide guidance when this occurs. Practically, it is best if you just try to stick with a 32-bit version of Linux for now. I recommend Ubuntu 10.10 32-bit.
But if you need to use a 64-bit Linux, the first thing you want to do is make sure that these 32-bit compatibility libraries have been installed. On Ubuntu (and other Debian-based versions), this Terminal command usually works:
# sudo apt-get install ia32-libs
You should also be able to do this using the Synaptic Package Manager (search for ia32):
Depending on the version of Linux, you may also need to do some other things in order to get the installers for Real Studio and Feedback to run.
Check out Christian Schmitz's post How to install Real Studio on 64 bit Linux for some additional tips.
Christian notes that he is still having trouble getting 32-bit versions of libwebkit and libgtkhtml to install, which breaks HtmlViewer. I've seen the same thing. Apparently, the install of ia32-libs does not include these libraries. I ran into this with a client a year or so ago and I never found a way to get these libraries to installed on Ubuntu, so if there are any Linux experts out there with some suggestions, please leave a comment.