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Missing keys/repositories errors in terminal - best way or guide to remove them

rs flag

After using Linux Mint on the family's old machine for the past year I decided to try Ubuntu today. Very happy with it so far, but looks like I have been messing around a bit too much with it cause now I got some errors in the terminal when sudo apt update (please see here) that I would very much like to fix. Any help is much appreciated!

ar flag
Which version of Ubuntu did you install? Please don't put screenshots of the terminal. Always copy the text from the terminal and paste it directly into the question. Then format the pasted text as `code` using the {_} icon above the edit window.
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