Update known-issues.txt

Author: Christian Weichel

known-issues.txt

@@ -1,4 +1,5 @@
 Known issues:
     - arduino-cli does not get stopped reliably upon app shutdown
     - startup time is not as fast we'd like to have it
-    - in Electron on OSX, the application menu is incomplete on app startup (see https://github.com/theia-ide/theia/issues/5100)
+    - in Electron on OSX, the application menu is incomplete on app startup (see https://github.com/theia-ide/theia/issues/5100)
+    - on Linux "New Sketch" does not work. It uses the current sketch URI instead of the workspace root.