I tried to upgrade the mesa package using the ppa ppa:oibaf/graphics-drivers.
But there comes this error message while upgrading essential packages
The following packages have unmet dependencies: gnome-control-center : Depends: libcheese-gtk23 (>= 3.4.0) but it is not going to be installed Depends: libcheese7 (>= 3.0.1) but it is not going to be installed
I tried sudo apt-get install libcheese-gtk23 libcheese7, but it says its already the latest version and the version numbers satisfy the error
I don't know what to do about this problem.