If you have used the Ubuntu version of XMind lately, you may have encountered an annoying bug; While the program itself works, the splash screen hangs in the background and is unable to be closed. Thankfully, there’s a simple workaround. All you have to do is modify the ini file so that the program gets passed the ‘nosplash’ argument on startup, preventing the splash screen from opening in the first place.

In order to make the change, enter the following into your terminal:

sudo sed -i '1i-nosplash' /usr/local/xmind/XMind.ini

Hooray! No more annoying splash screen. Credit for the solution goes to user ac: 

https://xmind.desk.com/customer/portal/questions/5667621-xmind-startup-bug-in-ubuntu-13-4