Hello
I have tried to install your youtube video instructions Openmediavault NAS software but I have a problem. When I put the apt-get upgrade command, that command does not do what it would have to do, and I'm not asked yes / no. Nor does the window open to you in the terminal. You see my problem in the picture. I really don't know what to do. Thanks for help!
My Raspberry Pi model is: Raspberry Pi 3 B+
Problem image link: https://aijaa.com/3HX7nB