Linux (ubuntu to be specific) launcher bug.

When you click play on the minecraft launcher it automatically closes and launches the game as expected, except the launcher is still in your background processes even when you close the game. When you try to re-open the launcher it won't open until you end the background processes.

 

Screenshot:

 

As you can see the minecraft launcher is in the background but it's not open.

 

NOTE: The bug does not always happen, but it happens way too much.