Updating currently installed packages, please wait… W: GPG error: https://packages.sury.org/apache2 stretch InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY B188E2B695BD4743
W: The repository ‘https://packages.sury.org/apache2 stretch InRelease’ is not signed.
W: GPG error: https://mirror.mva-n.net/mariadb/repo/10.4/debian stretch InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY F1656F24C74CD1D8
W: The repository ‘https://mirror.mva-n.net/mariadb/repo/10.4/debian stretch InRelease’ is not signed.
W: GPG error: https://packages.sury.org/php stretch InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY B188E2B695BD4743
W: The repository ‘https://packages.sury.org/php stretch InRelease’ is not signed.
W: GPG error: https://nginx.org/packages/mainline/debian stretch InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY ABF5BD827BD9BF62
W: The repository ‘https://nginx.org/packages/mainline/debian stretch InRelease’ is not signed.
W: GPG error: https://apt.hestiacp.com stretch InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY A189E93654F0B0E5
W: The repository ‘https://apt.hestiacp.com stretch InRelease’ is not signed.
-E: There were unauthenticated packages and -y was used without --allow-unauthenticated
Updating currently installed packages, please wait... W: GPG error: https://mirror.mva-n.net/mariadb/repo/10.4/debian buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F1656F24C74CD1D8
E: The repository 'https://mirror.mva-n.net/mariadb/repo/10.4/debian buster InRelease' is not signed.
W: GPG error: https://nginx.org/packages/mainline/debian buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABF5BD827BD9BF62
E: The repository 'https://nginx.org/packages/mainline/debian buster InRelease' is not signed.
W: GPG error: https://apt.hestiacp.com buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A189E93654F0B0E5
E: The repository 'https://apt.hestiacp.com buster InRelease' is not signed.
W: GPG error: https://packages.sury.org/apache2 buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B188E2B695BD4743
E: The repository 'https://packages.sury.org/apache2 buster InRelease' is not signed.
W: GPG error: https://packages.sury.org/php buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B188E2B695BD4743
E: The repository 'https://packages.sury.org/php buster InRelease' is not signed.
The installer is now downloading and installing all required packages.
NOTE: This process may take 10 to 15 minutes to complete, please wait…
I saw this message too yesterday. it seems there is something off with the GPG keys for the sury repos. at least for the debian ones, I think for Ubuntu it’s handled differently.
for me it nevertheless installed everything just fine - I’d expect it to be fixed in a few days. however these repositories are third party, so not really something we can do a lot about…
PS: last time some key for ondrej (the maintainer of sury) which is used to resign the keys had to be reissued or something like that… google knows the whole story