I have locked the byobu icon in my unity menu. When I click it I would expect to have a window for this icon. 

But this does not happen. What actually happens is when I click it for the first time, it opens a Terminal window, with it's own, new icon in the menu (so now I have an byobu icon which looks like is not started, and an unwanted terminal icon). If I click the byobu icon a second time, it opens a new terminal window.

I have this problem since I got a new laptop (ubuntu 15.10). On my old laptop it works as expected (ubuntu 14.04 LTS).

How can I fix this?

Edit:
From the comments:

The Exec line in /usr/share/applications/byobu.desktop:

```
Exec=env TERM=xterm-256color byobu

```