What is the output of "apt-cache policy xlibmesa-gl-dev" and also "apt- cache policy xlibmesa-glu-dev" ? You can run this in the terminal (applications -> accessories - > terminal)
Do you have any unofficial repositories enabled? -- Can't install freeglut3-dev https://launchpad.net/bugs/60103 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
