Sudo apt update warning

Today when I tried a sudo apt update I received several warnings ..... not sure just what they mean ..... should I be concerned ?????????

Usually no. you can remove the error by going into Software & Updates and remove the offending repositories.

By golly Wally you is right ..... thank you sir .... I'll check it again after I get some new updates and see if it came back .....

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Thanks swarfendor437 I copied and pasted that info into my Documents Folder ....