Anyway, my line is correct if you copied it exactly as shown in my answer. Please add output of /etc/apt/sources.list.d/mozilla.list to the question.
– N0rbertOct 08 '18 at 20:08
1 Answers1
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The red warning dot disappeared and I can run updates and install things since I ran the code properly, the same code that caused the problem when I input it wrong.
sources.list
say? – E.T. Oct 08 '18 at 12:25/etc/apt/sources.list.d/mozilla.list
to the question. – N0rbert Oct 08 '18 at 20:08