REBOL for Ubuntu Linux
We've just released a new REBOL/Core and REBOL/View for Ubuntu Linux 5.10 for x86. Building for Ubuntu proved to be a challenge (so much so, that you begin to wonder if anyone actually develops software on Ubuntu, or perhaps they use Debian to cross develop. Ubuntu is certainly not a Linux system for developers.)
So, if you use Ubuntu Linux (or systems that are similar), give these new releases a try. You can find them in the builds area, in the 042 directory. Here is a link. Look for files with ub510.