After a couple of hours fighting, I got Just Dance 2017 running smoothly. About Uplay crashing at startup, I fixed it by running it outside of Steam but with WINEPREFIX and WINESERVER variables set to Steam installation:

$ WINESERVER="/home/user/.steam/steam/steamapps/common/Proton 3.16/dist/bin/wineserver" WINEPREFIX="/home/user/.steam/steam/steamapps/compatdata/446560/"; export WINESERVER WINEPREFIX $ wine ~/.local/share/Steam/steamapps/compatdata/446560/pfx/drive_c/Program\ Files\ (x86)/Ubisoft/Ubisoft\ Game\ Launcher/Uplay.exe

This will upgrade Uplay and make it launchable

Step 2, while Uplay will launch, its window will be transparent, therefore non usable, this is solved by installing corefonts with winetricks

$ wget https://raw.githubusercontent.com/Winetricks/winetricks/master/src/winetricks $ chmod +x winetricks $ ./winetricks

Last but not least, Uplay will launch and show, you'll be able to login but you'll end up seeing "Connection lost, A Ubisoft service is not available at the moment. You can try again later or switch to offline mode." while "Initializing". This is fixed by the trick shown here https://github.com/ValveSoftware/Proton/issues/1923

$ cd .steam/bin32/steam-runtime/i386/usr/lib/i386-linux-gnu/ $ rm libgnutls.so.26 $ ln -s /usr/lib/i386-linux-gnu/libgnutls.so.30.14.10 libgnutls.so.26

And that's it, the game then starts perfectly and pairs with the mobile app without any issue.

HTH