Well, I have been trying to figure out why I couldn't mount a ceph fs on through the GUI. After hours of searching and digging I couldn't find anything. Finally I was so tired of everything, that intead of putting three monitors in the monitor field, I just put one to prevent me from typing. And Voila, it works. So apparently cephfs works with just 1 monitor specified in the gui. Multiple monitors make it unmountable.