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Development Linux Ubuntu

Cannot get Ubuntu software update to work

When I run software updater and the repository tries to reload, always produces the error message below? Please help

W:GPG error: http://ppa.launchpad.net/gezakovacs/ppa/ubuntu bionic InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY D45DF2E8FC91AE7E, E:The repository ‘http://ppa.launchpad.net/gezakovacs/ppa/ubuntu bionic InRelease’ is not signed.

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