Error 256/Lutris not working after update

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1

I don’t know if it is a GoG problem or wine. However every time I install GoG Galaxy it starts after Installation but somehow in background the installation process returns code 256. After restarting Lutris, the app is gone. I once had installed it properly, but some day I was unable to find the app that should be listed in the Library at ‘Games’. Other GoG-games that are installed by Lutris itself and not via Galaxy are working though.

I found several ‘fixes’, suggesting to delete the .Wine folder (or .wine) which is not existing on my system. (Yes I am aware that the folder is hidden and must be listed with ls -la). So I made a system-wide search for the directory with no result. However all the fixes I found are several years old. There also is a thread inside this forum that has not been answered.

I am running Lutris on a Linux Mint system 22.3; Lutris version 0.5.22

So I found out that neither my Lutris, nor the GOG-Galaxy-Version are up to date. I updated Lutris and tried to install GoG from it’s exe installation file. The installer simply sais “install umu to use Proton”. It stays there forever untill you kill the task or exit Lutris. Worse: no other game seems to work anymore since I should install umu-launcher, which I tried and failed, because there is an installation file missing.

Any Ideas?

2

Here is the error details:

Install umu to use Proton

Traceback (most recent call last):

  File "/usr/lib/python3/dist-packages/lutris/exception_backstops.py", line 35, in wrapper
    result = function(*args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/usr/lib/python3/dist-packages/lutris/game.py", line 777, in configure_game
    raise error

  File "/usr/lib/python3/dist-packages/lutris/util/jobs.py", line 62, in target
    result = self.function(*a, **kw)
             ^^^^^^^^^^^^^^^^^^^^^^^

  File "/usr/lib/python3/dist-packages/lutris/runners/wine.py", line 1128, in prelaunch
    for manager, enabled in self.get_dll_managers().items():
                            ^^^^^^^^^^^^^^^^^^^^^^^

  File "/usr/lib/python3/dist-packages/lutris/runners/wine.py", line 1144, in get_dll_managers
    is_proton = proton.is_proton_path(self.get_executable())
                                      ^^^^^^^^^^^^^^^^^^^^^

  File "/usr/lib/python3/dist-packages/lutris/runners/wine.py", line 816, in get_executable
    return proton.get_umu_path()
           ^^^^^^^^^^^^^^^^^^^^^

  File "/usr/lib/python3/dist-packages/lutris/util/__init__.py", line 39, in __call__
    self.cached_item = self.function()
                       ^^^^^^^^^^^^^^^

  File "/usr/lib/python3/dist-packages/lutris/util/wine/proton.py", line 86, in get_umu_path
    raise MissingExecutableError("Install umu to use Proton")

lutris.exceptions.MissingExecutableError: Install umu to use Proton

Lutris log:
[INFO:2026-07-03 12:26:27,514:application]: Starting Lutris 0.5.22
[INFO:2026-07-03 12:26:27,625:startup]: "card1" is AMD Radeon RX 6800 (1002:73bf 1da2:e437 amdgpu) Driver 25.2.8
[INFO:2026-07-03 12:26:27,732:startup]: "card0" is AMD Ryzen 7 7700X 8-Core Processor (1002:164e 1458:d000 amdgpu) Driver 25.2.8
[ERROR:2026-07-03 12:26:29,443:jobs]: Error while completing task <bound method wine.prelaunch of <lutris.runners.wine.wine object at 0x774659667aa0>>: <class 'lutris.exceptions.MissingExecutableError'> Install umu to use Proton
[ERROR:2026-07-03 12:26:29,444:exception_backstops]: The Planet Crafter (wine) has encountered an error: Install umu to use Proton
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/lutris/exception_backstops.py", line 35, in wrapper
    result = function(*args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lutris/game.py", line 777, in configure_game
    raise error
  File "/usr/lib/python3/dist-packages/lutris/util/jobs.py", line 62, in target
    result = self.function(*a, **kw)
             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lutris/runners/wine.py", line 1128, in prelaunch
    for manager, enabled in self.get_dll_managers().items():
                            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lutris/runners/wine.py", line 1144, in get_dll_managers
    is_proton = proton.is_proton_path(self.get_executable())
                                      ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lutris/runners/wine.py", line 816, in get_executable
    return proton.get_umu_path()
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lutris/util/__init__.py", line 39, in __call__
    self.cached_item = self.function()
                       ^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lutris/util/wine/proton.py", line 86, in get_umu_path
    raise MissingExecutableError("Install umu to use Proton")
lutris.exceptions.MissingExecutableError: Install umu to use Proton
[WARNING:2026-07-03 12:26:29,444:game]: The game has run for a very short time, did it crash?