I have xenial, so before the end of the year I started using the LXD from backports. Now whenever I do apt update, I get an error about some files from the old LXD repo missing from the web. That’ understandable, because that repo has been retired.
But how do I remove that repo from my system? I found no such thing in the documentation anywhere.
I found the command apt-add-repository --remove, but I dont’ know what I should add after that, as a parameter. Please help.