I have looked many places for this, and many solutions are provided. I think I have tried them all. Some advise going into a list called "etc/apt/list" or something like that. I thought I did that one right, but I'm not sure.
This is the message:
Failed to fetch http://ppa.launchpad.net/do-core/ppa...86/Packages.gz 404 Not Found
Some index files failed to download, they have been ignored, or old ones used instead.
Could you help me on that? I may need step by step instructions.
I know how to use the lists and do stuff in the terminal, but...still a beginner.
Haven't been able to recheck for updates for over 100 days.
First person with right answer gets