1. whois
sudo apt install nsd
Setting up nsd (4.3.9-1) ... Created symlink /etc/systemd/system/multi-user.target.wants/nsd.service → /lib/s ystemd/system/nsd.service. Could not execute systemctl: at /usr/bin/deb-systemd-invoke line 142. Processing triggers for man-db (2.10.2-1) ... Processing triggers for libc-bin (2.35-0ubuntu3.1) ...