Hello! I am a technologically challenged 62 year old who has been using Linux since my Son introduced me to it years ago. He has always maintained/looked after it for me. However, now I’m on my own and need help! I have Kubuntu 18.10 KDE Plasma. No matter what I try (via Google searches) Kubuntu just wont let me upgrade/update. I’m not too good at explaining things, but I have saved the messages after attempting various things. I dont understand what the messages are telling me - other than my version is old/outdated/no longer supported??? If this is the case, then I should upgrade/update. But my version wont let me! I have attached the messages.
Please please can someone help me? Oh dear - I can only post 1 item because I am a new user. I have the others if someone needs to see them.