I want to reset Unity. But when I type unity --reset I get the following error: Xlib: extension "GLX" missing on display ":0.0". Xlib: extension "GLX" missing on display ":0.0". Xlib: extension "GLX" missing on display ":0.0". Compiz (opengl) - Fatal: glXCreateContext failed Compiz (bailer) - Info: Ensuring a shell for your session ... I am not using Compiz! I am using Metacity. Thanks a lot :) EDIT: I am using Unity. And I want to reset it as the sidebar is always shown when I am viewing my desktop (although it hides automatically if I am using other applications) and Alt+Tab switches the windows in a different, poor way (not the default one of Ubuntu 11.10).