Draft: add Unity 2021 editor fixes

content/docs/vrchat/unity.md

@@ -186,3 +186,25 @@ If you launch projects from Unity Hub: Open Unity Hub, click the `...` icon to t
 Alternatively, downgrading the Nvidia driver to version 545 may also fix the problem.
 
 <!-- This fix is mentioned in https://discussions.unity.com/t/unity-editor-crashes-frequently-on-linux-vulkan-after-updating-gpu-drivers/941387/10, and appears to be a new issue as of driver version 550 -->
+### Unity 2021 crashing
+For unity 2021.3.x on linux, the following steps should be followed: (TODO: mention original forum post)
+
+install the correct version along with windows/linux build support.
+go to ~/Unity/Hub/Editor/2021.3.xxxx/Editor/Data, (TODO:talk other paths)
+rename bee_backend to bee_backend.bin,
+create a new text file named bee_backend in the same directory,
+mark it as executable (so chmod 755 bee_backend or use your file browser),
+fill it with these contents:,
+
+#!/bin/bash
+ 
+args=("$@")
+for ((i=0; i<"${#args[@]}"; ++i))
+do
+    case ${args[i]} in
+        --stdin-canary)
+            unset args[i];
+            break;;
+    esac
+done
+${0}.bin "${args[@]}"