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Make sure to check Sign . Select Yes , the warning is only because the key was not certified. See 1.3 Key signing/certification (advanced) for more information. 3.11 Change validity date To change the validity date of your PGP key it is recommended to either use Kleopatra or gpg as there is no option to update the expiry date of the subkeys in gpa. 3.12 Backup keys Right-click on your key and click Backup...