The first step in running Minecraft on Ubuntu Linux is to make sure you have a version of Java that works well with Minecraft. We’ll walk you through it here: Installing Oracle Java on Ubuntu Mac and Windows users have a convenient launcher to start the game-but, if you’re using Ubuntu, how do you get Minecraft running? I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.If you’re one of the millions of fans of the game Minecraft, you may be aware that it runs on Java, which is available not only for Mac and Windows, but also Linux. : Unhandled exception in thread ThreadĬom.圎xception: duplicate key: nullĪt .bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~Īt .bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~Īt .bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~Īt .bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~Īt .fromJson(Gson.java:795) ~Īt .fromJson(Gson.java:761) ~Īt .fromJson(Gson.java:710) ~Īt .fromJson(Gson.java:682) ~Īt .RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~Īt .MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~Īt .MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~Īt .(AbstractGameRunner.java:67) ~Īt .GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~Īt .runWorker(ThreadPoolExecutor.java:1142) ~Īt $n(ThreadPoolExecutor.java:617) ~Īt java.lang. In the launcher log, I see a stack trace as follows: When I press the "Play" button I see the message "Preparing.", and nothing else happens. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. I use the old Java launcher because the new one does not work on my Linux distribution. I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now. Instead, I've opened a thread on Reddit if you need support. If you have trouble following these steps above, please do not comment on this ticket. Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.Delete the first downloads object ("downloads", and everything inside of the curly braces behind).Edit the "id": "" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".json file in a text editor of your choice. For instance, for 1.14.4, that would be 1.14.4-fix.json. json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.jar. Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4. You may choose a custom name, but not the name of any vanilla version. json" links to download a client.jar file, and a. Click the "Download → Client" and "Download →. Here, you find links to download the version files directly from Mojang's servers.
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