Introduced RHEL/RockyLinux 9 support (and new GPG Package Signing Keys)

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This is to announce the availability of ntop packages for RedHat EL9 / RockyLinux 9 at This has forced us to change many things in the way we build packages due to the deprecation of the SHA-1 algorithm. Because of this we had to modify the GPG signing keys used to sign the ntop packages for all platforms (and thus not limited to RHEL/RockyLinux 9). This has the side effect that for installed system, you need to reinstall the apt-ntop/apt-ntop-stable (Ubuntu/Debian) or yum update (CentOS/RHEL/RockyLinux).

For all details we have written a note in our FAQs that we invite everyone to read as the above changes have an impact on all platform and not only RHEL/RockyLinux 9.