@ykanello: To add to the above, gtk+ with the (default) GTK+ Input Method works fine. What I suspect as the source of the problem that you exhibit, is some configuration mix-up with iBus, which shouldn't be enabled for Greek.
For the issue that you describe with gtk+ apps, please write at the Ubuntu-gr (Greek) forum at http://forum.ubuntu-gr.org/ so that we can resolve there.
@ykanello: To add to the above, gtk+ with the (default) GTK+ Input Method works fine. What I suspect as the source of the problem that you exhibit, is some configuration mix-up with iBus, which shouldn't be enabled for Greek.
For the issue that you describe with gtk+ apps, please write at the Ubuntu-gr (Greek) forum at http:// forum.ubuntu- gr.org/ so that we can resolve there.