> but when I try to
> enable wifi it does not work, it says "secrets are required but not
> provided"

How did you try to connect? nmcli? nmtui?

> now I am on Trisquel
> Mini instead i3

So it works in LXDE (Trisquel Mini) but not i3?

> Or if I could use some graphical program to connect by wifi on
> i3, I don know those programs

Sure. If you run nm-applet in a terminal it should appear in your i3
bar. Or you can add it to ~/.config/i3/config so that it starts
automatically when you log in. See here[1] for instructions.

Alternatively, you could install a desktop environment and replace its
window manager with i3. A desktop environment configures things like
networking (and other nice things like automatically mounting usb drives
and detecting monitors) to work out of the box.

I use MATE, but I replace MATE's window manager (Metacity) with i3 and
remove mate-panel. The result looks just like i3, but things "work" as
they do in MATE.

$ dconf write /org/mate/desktop/session/required-components/windowmanager "'i3'"
$ dconf write /org/mate/desktop/session/required-components/panel "''"
$ dconf write /org/mate/desktop/background/show-desktop-icons "false"

It's probably possible to do the same thing with LXDE.

[1] 
https://i3wm.org/docs/userguide.html#_automatically_starting_applications_on_i3_startup

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