Comment 12 for bug 1610434

While xenial itself has a libegl1-mesa-drivers as a dummy package:

 $ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS"
[ 8:40AM 10006 ] [ bdmurray@impulse:~ ]
 $ apt-cache search libegl1-mesa-drivers
libegl1-mesa-drivers - transitional dummy package
libegl1-mesa-drivers-lts-utopic - Transitional package for libegl1-mesa-drivers-lts-utopic
libegl1-mesa-drivers-lts-utopic-dbg - Transitional package for libegl1-mesa-drivers-lts-utopic-dbg

There are no libgel1-mesa-drivers-lts-(vivid|wily|xenial) packages.

bdmurray@upgrade-trusty-amd64:~$ apt-cache search libegl1-mesa-drivers-lts
libegl1-mesa-drivers-lts-quantal - Transitional package for libegl1-mesa-drivers
libegl1-mesa-drivers-lts-quantal-dbg - Transitional package for libegl1-mesa-drivers-dbg
libegl1-mesa-drivers-lts-raring - Transitional package for libegl1-mesa-drivers
libegl1-mesa-drivers-lts-raring-dbg - Transitional package for libegl1-mesa-drivers-dbg
libegl1-mesa-drivers-lts-saucy - Transitional package for libegl1-mesa-drivers
libegl1-mesa-drivers-lts-saucy-dbg - Transitional package for libegl1-mesa-drivers-dbg
libegl1-mesa-drivers-lts-trusty - Transitional package for libegl1-mesa-drivers
libegl1-mesa-drivers-lts-trusty-dbg - Transitional package for libegl1-mesa-drivers-dbg
libegl1-mesa-drivers-lts-utopic - free implementation of the EGL API -- hardware drivers
libegl1-mesa-drivers-lts-utopic-dbg - free implementation of the EGL API -- driver debugging symbols