Issue apt cache fetch failed / Package update manager notification

[alonzofer041]

Server operating system version

Ubuntu 24.04.2

Plesk version and microupdate number

Obsidian 18.0.67 #3

Greetings.

I have an error every day with automatic updates, I receive notifications every morning with error message like this:

025-06-10 06:25:38 INFO: pum is called with arguments: ['--list', '--repo-info', '--json']
2025-06-10 06:25:38 ERROR: Apt cache fetch failed: W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /pool/PSA_18.0.66_16134 noble InRelease: The following signatures were invalid: 8BADC1A02FC9C07FB8C20EC0BD11A6AA914BDF7E (untrusted public key algorithm: dsa1024), W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /PHP74_17 noble InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9299045CE550E57, W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /PHP82_17 noble InRelease: The following signatures couldn't be verified because the public key is not available: NO _PUBKEY E9299045CE550E57, W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /PHP83_17 noble InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9299045CE550E57, W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /grafana/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9299045CE550E57, W:GPG error: Index of /imunify360/ubuntu/24.04/ noble InRelease: The following signatures were invalid: 9EE467641C635726A184D64B8C55A6628608CB71 (untrusted public key algorithm: dsa1024), E:The repository 'Index of /imunify360/ubuntu/24.04/ noble InRelease' is not signed.
2025-06-10 06:25:38 ERROR: W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /pool/PSA_18.0.66_16134 noble InRelease: The following signatures were invalid: 8BADC1A02FC9C07FB8C20EC0BD11A6AA914BDF7E (untrusted public key algorithm: dsa1024), W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /PHP74_17 noble InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9299045CE550E57, W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /PHP82_17 noble InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9299045CE550E57 , W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /PHP83_17 noble InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9299045CE550E57, W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /grafana/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9299045CE550E57, W:GPG error: Index of /imunify360/ubuntu/24.04/ noble InRelease: The following signatures were invalid: 9EE467641C635726A184D64B8C55A6628608CB71 (untrusted public key algorithm: dsa1024), E:The repository 'Index of /imunify360/ubuntu/24.04/ noble InRelease' is not signed.
2025-06-10 06:25:38 ERROR: Exited with returncode 1.

How can I solve this?

 

[Sebahat.hadzhi]

Hello, @alonzofer041 . Please try adding the missing keys following the instructions here. For Grafana, please try fetching and installing the key by running the following command:

wget -q -O - http://autoinstall.plesk.com/plesk.gpg | gpg --dearmor > /etc/apt/keyrings/plesk-ext-grafana.gpg

Regarding the Imunify warnings, Cloudlinux are aware and currently working on resolving the matter. We can suggest the following temporary workaround.

There are also couple of existing threads discussing these issues and I would like to encourage you to check them:

• Resolved - Weak Algorithm Warning (DSA1024) for Plesk Repositories on Ubuntu 24.04 LTS
• Resolved - error occurred during the signature verification

 

[alonzofer041]

I tried to add PHP missing keys, but the command gave me this message: "keyserver receive failed: no data"; I think this cause the update error and the reason that i can't update plesk because I red the rest of my log are warnings. How could I change those keys?