Unable to install HestiaCP

Hello everyone,

I am unable to install hestiacp on two fresh VPS.

VPS 1:
Debian 11 x86_64 Minimal

VPS 2:
Debian 12 x86_64 Minimal

Getting almost same error message during installation.

Updating currently installed packages, please wait... W: GPG error: https://apt.hestiacp.com bookworm InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A189E93654F0B0E5
Extracting templates from packages: 100%com bookworm 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...
E: Unable to locate package hestia
E: Unable to locate package hestia-nginx
E: Unable to locate package hestia-php

Thank you in advance.