Looks like uplay become crashable after update.

$ ps aux | grep upc
mikhail 27024 1.8 0.1 2693872 53868 pts/2 Sl+ 23:37 0:00 C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\UbisoftGameLauncher.exe -gamelauncher_wait_handle 220 -upc_uplay_id 632 -upc_game_version 0 -upc_exe_path WjpcaG9tZVxtaWtoYWlsXC5sb2NhbFxzaGFyZVxTdGVhbVxzdGVhbWFwcHNcY29tbW9uXEFzc2Fzc2luJ3MgQ3JlZWQgTGliZXJhdGlvblxhYzNsaGRfMzIuZXhl -upc_working_directory WjpcaG9tZVxtaWtoYWlsXC5sb2NhbFxzaGFyZVxTdGVhbVxzdGVhbWFwcHNcY29tbW9uXEFzc2Fzc2luJ3MgQ3JlZWQgTGliZXJhdGlvbg== -upc_arguments LXVwbGF5X3N0ZWFtX21vZGU= -uplay_steam_mode
mikhail 27027 14.6 0.0 0 0 pts/2 Zl+ 23:37 0:02 [upc.exe] <defunct>
mikhail 27149 0.0 0.0 215752 900 pts/20 S+ 23:38 0:00 grep --color=auto upc
Just launch the game.
That's basically issue #2268. We can still have this one open until it's verified that game itself has no issues.
for me with the new proton version uplay is running fine but the game gives me a black screen
With Proton 3.16.8-beta this issue still occurs. Now we have uplay launching and updating and the game does launch but shows only a black screen when using PROTON_USE_WINED3D. Using PROTON_NO_D3D11 other any other combination of options simply results in the game instantly closing after uplay launches and triggers the main game exe file.
Hello @Shatrico, @howels, with Proton 3.16-8, can one of you add PROTON_LOG=1 %command% to the game's launch options and drag and drop the generated $HOME/steam-$APPID.log into the comment box.

Disabling "in-game overlay" which helps play in Assassins Odyssey didn't helps here.
This works with Lutris and 32-bit Vulkan with DXVK 1.0.1 (using either Wine 3.21 or 4.0) but produces a black screen in Steamplay with Proton 3.16-8.
Using Proton 4.2-1 needed to manually trigger the proton download. Game quits to desktop when uplay overlay is disabled, with overlay a black screen and a hang.
Log attached with overlay disabled.
steam-260210.log
Looks like this game needs Media Foundation support.
This game works when running from Lutris using Windows Steam via Wine 4.0 + DXVK. Is there a library in the Windows Steam client or is it present in Wine but missing from Proton?
Is there a way to auto-kill upc.exe when exit the game? It's quite annoying to kill it by the terminal/monitor every time you end an uplay game
@vjr2 please look in the uplay settings and disable minimize to system tray.
Most helpful comment
Is there a way to auto-kill upc.exe when exit the game? It's quite annoying to kill it by the terminal/monitor every time you end an uplay game