Если при установке ispmanager на старый debian/ubuntu получаем ошибку W: GPG error: http://download.ispsystem.com/repo/debian 6-stable5-stretch InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 73CF0BC7810F8996W: The repository ‘http://download.ispsystem.com/repo/debian 6-stable5-stretch InRelease’ is not signed.N: Data from…