Hey,

I experienced a crash on Linux / debian buster which seems to originate not in the game code itself but in the GOG Galaxy libraries. Stacktrace:

terminate called after throwing an instance of 'std::runtime_error'
what(): locale::facet::_S_create_c_locale name not valid
Stacktrace:

at <unknown> <0xffffffff>
at (wrapper managed-to-native) Galaxy.Api.GalaxyInstancePINVOKE.Init (System.Runtime.InteropServices.HandleRef) <0x0006f>
at Galaxy.Api.GalaxyInstance.Init (Galaxy.Api.InitParams) <0x00023>
at StardewValley.SDKs.GalaxyHelper.Initialize () <0x0004b>
at StardewValley.GameRunner.Initialize () <0x0004a>
at Microsoft.Xna.Framework.Game.DoInitialize () <0x0002b>
at Microsoft.Xna.Framework.Game.Run (Microsoft.Xna.Framework.GameRunBehavior) <0x0009f>
at Microsoft.Xna.Framework.Game.Run () <0x00027>
at StardewModdingAPI.Framework.SCore.RunInteractively () <0x00fbb>
at StardewModdingAPI.Program.Start (string[]) <0x00147>
at StardewModdingAPI.Program.Main (string[]) <0x001c3>
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <0x000c8>

Native stacktrace:

./StardewModdingAPI.bin.x86_64() [0x45124d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12730) [0x7f8bf488b730]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x10b) [0x7f8bf46d58bb]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x121) [0x7f8bf46c0535]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x84fb65) [0x7f8b1d960b65]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x7b8bc6) [0x7f8b1d8c9bc6]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x7b8c11) [0x7f8b1d8c9c11]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x7b8d44) [0x7f8b1d8c9d44]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x80551a) [0x7f8b1d91651a]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x84ff74) [0x7f8b1d960f74]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x7bf75c) [0x7f8b1d8d075c]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x7c069a) [0x7f8b1d8d169a]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x5b5f63) [0x7f8b1d6c6f63]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(+0x174953) [0x7f8b1d285953]
/home/user/games/Stardew Valley/game/./lib64/libGalaxy64.so(_ZN6galaxy3api4InitERKNS0_11InitOptionsE+0x19) [0x7f8b1d27c059]
./lib64/libGalaxyCSharpGlue.so(_Z4InitRK10InitParams+0x56) [0x7f8b1debb786]
./lib64/libGalaxyCSharpGlue.so(CSharp_GalaxyfApi_Init___+0xb) [0x7f8b1ded2e6b]
[0x41ad4c50]

Debug info from gdb:

AL lib: (EE) alc_cleanup: 1 device not closed

=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

Aborted

Fortunately, removing both libGalaxy libraries work arounds the issue. Just do:

cd game/
mv lib64/libGalaxy* ~/

(for example)
Then the game will throw you an error on Galaxy.Api.GalaxyInstancePINVOKE (saying libGalaxyCSharpGlue.so couldn't be found, naturally) but it'll still run fine after that.

In an update to this, it appears the structure of the game folder has changed since this tip was posted. To disable the Galaxy code, move the following files out of the game/ folder (there is no lib64 subfolder):

Galaxy64.dll
libGalaxy64.so
libGalaxyCSharpGlue.so

These two files must remain, or the game will not launch:

GalaxyCSharp.dll
GalaxyCSharpGlue.dll