I have recently installed a clean copy of Ubuntu 8.04. It has gone great so far, but I am now having an unexpected error. Anytime I press Ctrl+F, a weird new terminal window opens up. I don't know how to change it so this doesn't happen. I checked in Keyboard Shortcuts but I didn't find any such keybinding there. I would really appreciate any help as this is preventing me from working in emacs!

Thanks in advance!