delete the applet to turn off the pc, in the task bar, and I can not add it for others that I am looking for that applets is not there, how do I solve it or is there another way to turn off the computer through software?

    Kevinsotovalle I assume you're using Budgie - if so this is a pretty simple issue.

    The applet that looks like a power button is called the User Indicator applet. Add that to your panel using Budgie Desktop Settings and you should be good to go.