After upgrading my laptop to KDE 4.8 I was unable to start Kwin GLES as default window manager. The only way was to switch it in console:
kwin_gles --replace &
It's not very comfortable. I found this hint on ArchWiki, and adapt it for Kubuntu:
First, you need kwin_gles installed:
sudo apt-get install kde-window-manager-gles
When it is installed, create new file ...
sudo nano /usr/share/kde4/apps/ksmserver/windowmanagers/kwin_gles.desktop
... with this content:
[Desktop Entry]
Name=KWin GLES
Exec=kwin_gles
TryExec=kwin_gles
X-KDE-WindowManagerConfigure=systemsettings
X-KDE-WindowManagerRestartArgument=--replace
Now you can change the window manager in the system settings: Open System Settings, go to Window Manager, select Use a different window manager: and select KWin GLES.
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