- use the following command to upgrade Linux Mint to Vera
Code: Select all
sudo mintupgrade
Reading package lists...
W: GPG error: https://cli.github.com/packages focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 23F3D4EA75716059
E: The repository 'https://cli.github.com/packages focal InRelease' is not signed.
Error - Return code: 100
- try to solve the NO_PUBKEY problem with
Code: Select all
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 23F3D4EA75716059
gpg: keyserver receive failed: server indicated a failure