Ubuntu to RedHat. Since Remmina is not in the default repositories that came with my new client I decided to use KRDC instead.
Overall I must say I am quite impressed with KRDC, it is easy and intutive to use. Its tabbed UI and storing of bookmarked sessions remind me very much of Remmina.
The one problem I have with KRDC is that it refuses to remember the passwords for each of my saved sessions. A dialog comes up prompting for the password with a check-box "remember this password" - I select this check-box but I still get prompted for a password the next time I connect. I assume this is a bug which will be fixed soon, but it is only a minor nuisance (I have a lot of passwords to remember).
A feature from Remmina I miss is the ability to automatically configure sharing between the local and remote machine, but again this is a feature I can live without for now.