Selecting region doesn't work as expected after upgrading from ubuntu 13.10 to 14.04

[Kevin]

I just upgraded from lubuntu 13.04 to 14.04. Before the update I was able to set a first mark using Ctrl-Space move the point to another position and then set another mark. Then the region between the last two marks was selectet and marked grey. This doesn't work anymore. However I can select a region by holdin the shift key and use the arrow keys but this is not what I want.

Any idea how to fix this? If not, is there a workaround?

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: emacs (not installed)
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Thu May 1 11:34:27 2014
InstallationDate: Installed on 2013-11-22 (159 days ago)
InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: emacs-defaults
UpgradeStatus: Upgraded to trusty on 2014-04-30 (0 days ago)

[Jereba (jere2001)]

It's simple to resolve.

In "Input Methods" change the Shortcut Keyboard to "Next input method".

[Kevin (kevin999)]

Thanks, but I don't really understand how to do it. What should I exactly add to my .emacs file?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Kevin (kevin999)]

After uninstalling ibus it worked as usual. Don't understand the role of ibus for this issue.