Well this won't be dealt with unfortunately as ibus has been using Ctrl+Space for many year.
** Changed in: ibus (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to ibus in Ubuntu. https://bugs.launchpad.net/bugs/1296772 Title: new ibus keybindings conflict with and block Emacs Status in “ibus” package in Ubuntu: Won't Fix Bug description: The key bindings for ibus "next input method" conflicts with Emacs and prevents its use. ibus should not use ctrl+space for anything, leave that for Emacs. Some other key combination can be used such as ctrl+shift+space, maybe: https://help.ubuntu.com/community/Lubuntu/Keyboard Regardless, ctrl-space cannot be used. Using ctrl+space prevents the use of Emacs. IBus->Preferences->General->Keyboard shortcuts : next input method -> ctrl+shift+space ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: ibus 1.5.5-1ubuntu2 ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6 Uname: Linux 3.13.0-18-generic x86_64 ApportVersion: 2.13.3-0ubuntu1 Architecture: amd64 CurrentDesktop: LXDE Date: Mon Mar 24 16:57:26 2014 InstallationDate: Installed on 2014-03-07 (16 days ago) InstallationMedia: Lubuntu 14.04 "Trusty Tahr" - Alpha amd64+mac (20140307) SourcePackage: ibus UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ibus/+bug/1296772/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp