games score records are wiped out by ubuntu upgrade

[sds]

this is applicable to all games (observed with at least mahjongg and sol).
when I upgrade ubuntu (e.g., from 17.04 to 17.10), the high score records are wiped out.
this might be a one-time thing (going from unity to gnome) but it is still extremely disconcerting.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-mahjongg 1:3.22.0-1
ProcVersionSignature: Ubuntu 4.13.0-19.22-generic 4.13.13
Uname: Linux 4.13.0-19-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 17 22:43:50 2017
SourcePackage: gnome-mahjongg
UpgradeStatus: Upgraded to artful on 2017-10-22 (56 days ago)