Hello everyone.
I'm trying to run FAF on linux following this guide. I cannot launch the game via the launcher. I get an error message saying the selected mods could not be updated.
The game launches but only shows a gray square on an otherwise black screen. This is the same issue I run into when trying to run the game without any launch options from Steam.
So it looks like FAF is not running with the proper launch options.
The game works perfectly fine when launched via Steam and I copied the run file right after starting it successfully. So I have no idea what is causing the issue.
Any and all help is appreciated 
FAF Client Error:
java.util.concurrent.CompletionException: NotifiableException(i18nKey=mod.errorUpdatingMods, i18nArgs=[])
at org.springframework.aop.interceptor.AsyncExecutionAspectSupport.lambda$doSubmit$3(AsyncExecutionAspectSupport.java:281)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: NotifiableException(i18nKey=mod.errorUpdatingMods, i18nArgs=[])
at com.faforever.client.mod.ModService.writeModStates(ModService.java:371)
at com.faforever.client.mod.ModService.overrideActivatedMods(ModService.java:312)
at com.faforever.client.mod.ModService.updateAndActivateModVersions(ModService.java:433)
at com.faforever.client.mod.ModService$$FastClassBySpringCGLIB$$aae9cfd3.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
at org.springframework.aop.interceptor.AsyncExecutionInterceptor.lambda$invoke$0(AsyncExecutionInterceptor.java:115)
at org.springframework.aop.interceptor.AsyncExecutionAspectSupport.lambda$doSubmit$3(AsyncExecutionAspectSupport.java:278)
... 4 more
Caused by: java.io.IOException: Ist ein Verzeichnis
at java.base/sun.nio.ch.FileDispatcherImpl.read0(Native Method)
at java.base/sun.nio.ch.FileDispatcherImpl.read(FileDispatcherImpl.java:48)
at java.base/sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:330)
at java.base/sun.nio.ch.IOUtil.read(IOUtil.java:296)
at java.base/sun.nio.ch.IOUtil.read(IOUtil.java:273)
at java.base/sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:232)
at java.base/sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:65)
at java.base/sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:107)
at java.base/sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:101)
at java.base/java.nio.file.Files.read(Files.java:3244)
at java.base/java.nio.file.Files.readAllBytes(Files.java:3295)
at java.base/java.nio.file.Files.readString(Files.java:3366)
at com.faforever.client.mod.ModService.writeModStates(ModService.java:337)
... 13 more
Log Files: