Comment 20 for bug 1400626

I needed to do something like apt-get install xserver-xorg-lts-utopic libegl1-mesa-drivers-lts-utopic libgl1-mesa-glx-lts-utopic:i386

John Gilbertson (blackcap93) wrote on 2015-01-29: #13
The new xorg/mesa packages should, but don't, have a "Provides: <name-of-package-being-replaced>" field in the Debian control file, to avoid breaking other installed packages which depend on the older xorg/mesa packages by name; for example, the lib-gl1-mesa-glx-lts-utopic package's control file should contain "Provides: lib-gl1-mesa-glx"

$ apt-cache show libgl1-mesa-glx-lts-utopic | grep Provides
Provides: libgl1, libgl1-mesa-glx, xorg-renamed-package, xorg-renamed-package-lts-utopic

Although the provides: libgl1 should be enough in this case, no need for an explicit libgl1-mesa-glx but it's there anyway. ;-)