I'm not so sure that's a good idea.
You show two repositories that are missing their GPG keys.
Did you follow a guide to add them? For example:
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Try to disable solnode and cesium.
Not all. Only this cesium and solnode one's. I don't know for what You need them but it seems that there not signed properly. I think the best would be to remove these Repos and then take a Look at the Instructions of each and add them like described if You still should need them if not, You can deleted them and that's it.