Question: I need to change my FTP password, from an Ubuntu server with the command line, can you help me?

Thank you all!

Answer: 
The solution is simple, in options --> accounts --> Sign-in options: Require sign-in = Every Time

[![enter image description here](https://i.stack.imgur.com/Wey3J.png)](https://i.stack.imgur.com/Wey3J.png)
Very likely because of the Extended Display Option set for the Monitor. Set the display only to Monitor, it should work.