This is my first RC install, so I'm probably doing something silly, but I can't find a relevant FAQ.
I installed RC from the Ubuntu repositories (apt-get install roundcube-webmail) and configured it, but no sign of TinyMCE or anything similar. I've now installed RC2 from source and have the same problem, although at least this time the tiny_mce files are at least present in program/js which they weren't first time around.
How do enable HTML editing?
I have installed PHP curl modules, but my understanding is that would explain a failure of spell check in HTML edit mode, not a complete lack of that mode!