The page suggests:
Clean-up old packages ... And you can remove them with:
sudo dnf remove --duplicates
Unknown argument "--duplicates" for command "remove"
sudo dnf upgrade Updating and loading repositories: Repositories loaded. Nothing to do. sudo dnf remove --duplicates Unknown argument "--duplicates" for command "remove". Add "--help" for more information about the arguments. The argument is available for commands: check, repoquery. (It has to be placed after the command.)
sudo dnf upgrade Updating and loading repositories: Repositories loaded. Nothing to do.
sudo dnf remove --duplicates Unknown argument "--duplicates" for command "remove". Add "--help" for more information about the arguments. The argument is available for commands: check, repoquery. (It has to be placed after the command.)
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