$ hwe-support-status --show-replacements xserver-xorg-lts-xenial linux-generic-lts-xenial linux-image-generic-lts-xenial libgl1-mesa-glx-lts-xenial
Well, that's not a complete list...
Here I have libegl1-mesa-lts-wily, libgbm1-lts-wily, libgl1-mesa-dri-lts-wily, libwayland-egl1-mesa-lts-wily, libxatracker2-lts-wily, linux-headers-generic-lts-wily, xserver-xorg-input-all-lts-wily... no Xenial replacements are shown for them.
$ hwe-support-status --show-replacements xorg-lts- xenial linux-generic- lts-xenial linux-image- generic- lts-xenial libgl1- mesa-glx- lts-xenial
xserver-
Well, that's not a complete list...
Here I have libegl1- mesa-lts- wily, libgbm1-lts-wily, libgl1- mesa-dri- lts-wily, libwayland- egl1-mesa- lts-wily, libxatracker2- lts-wily, linux-headers- generic- lts-wily, xserver- xorg-input- all-lts- wily... no Xenial replacements are shown for them.