I remember that I have called update-manager by accident from the console (no X11-DISPLAY).
Probably it would be nice, if it would have a text mode interface that could be used when no display is available, but I know there are other commands that do the same at the command line, so it could also output some help text that might be useful for beginners . For example:
update-manager is a graphical user interface that needs an X11 Display.
If you do not have an X11 display, at the command line, you can use apt-get instead. See man apt-get for details.
I remember that I have called update-manager by accident from the console (no X11-DISPLAY).
Probably it would be nice, if it would have a text mode interface that could be used when no display is available, but I know there are other commands that do the same at the command line, so it could also output some help text that might be useful for beginners . For example:
update-manager is a graphical user interface that needs an X11 Display.
If you do not have an X11 display, at the command line, you can use apt-get instead. See man apt-get for details.