Could I please have you try running these commands to see if that resolves the issue?
Code: Select all
curl -fsSL https://repo.nagios.com/GPG-KEY-NAGIOS-V3 | sudo gpg --dearmor -o /etc/apt/keyrings/GPG-KEY-NAGIOS-V3.gpg
apt-get updateCode: Select all
curl -fsSL https://repo.nagios.com/GPG-KEY-NAGIOS-V3 | sudo gpg --dearmor -o /etc/apt/keyrings/GPG-KEY-NAGIOS-V3.gpg
apt-get update