Your system was crippled already when it was on 16.04. You probably
still have libgbm1-lts-wily or such installed which diverted the lib,
because on 14.04.x the original had to be used.
xenial-updates has had libgbm1-lts-$foo transitional packages since
early august, see bug #1573190
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Xorg does not utilize the 3D graphics acceleration capabilities of my
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