WHY CANT I UPDATE SMITE SERVER DOWN INSTALL

So I don't understand why it isn't updating to 21. The following packages have been kept back:Д to upgrade, 0 to newly install, 0 to remove and 1 not to upgrade. When I try to sudo dist-upgrade this happens: sudo apt dist-upgrade Sudo apt-key adv -keyserver -recv-keys F2EDC64DC5AEE1F6B9C621F0C8CAB6595FDFF622

WHY CANT I UPDATE SMITE SERVER DOWN INSTALL

I fixed it by doing this: sudo apt install -reinstall ubuntu-dbgsym-keyring GPG error: groovy-proposed Release: The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) The repository is not updated and the previous index files will be used. W: An error occurred during the signature verification.

GPG error: groovy-updates Release: The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) N: See apt-secure(8) manpage for repository creation and user configuration details. At the moment, we haven't detected any problems at Smite. An outage is determined when the number of reports are higher than the baseline, represented by the red line. N: Updating from such a repository can't be done securely, and is therefore disabled by default. The following chart shows the number of reports that we have received about Smite by time of day over the past 24 hours. When I first tried I was getting an error: W: GPG error: groovy Release: The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) Д®: The repository ' groovy Release' is not signed. I am wanting to update from Ubuntu 20.10 to 21.04.

Why cant i update smite server down