I'd try disabling the "Nokia System Software Updates" repository, exiting App Manager, then going back in and re-enabling it. That will force an update of all the repository metadata. If that doesn't fix it, the only other thing I can suggest is installing the dependencies manually. Make sure you have rootsh installed, then launch X Terminal and run: Code: root apt-get install libxmu6 libgles1
root apt-get install libxmu6 libgles1