Ubuntu 12.10 is still buggy, but I have found a workaround to get Chimera to work if you have AMD/ATI or NVIDIA graphics. If you change the desktop environment from the default Ubuntu environment to another, e.g., Xfce, then Chimera will work. Do do that, first install xfce4: sudo apt-get install xfce4 Then logout, and you will see an circular icon to the right of your login name. Click on that icon and choose "Xfce session" and OK. Then type in your password and you'll get the Xfce desktop environment (don't use a single panel unless you know what you're doing). And then Chimera will work as before from the desktop or the command line. There are other possible desktop environments and it appears that the ones that have a compositing window manager, e.g., kde plasma, don't work. If you are using a different desktop environment in Ubuntu 12.10 that works, please tell me about it. HTH, Greg