Cannot uninstall CLI client

I get this when I try to uninstall it.

I first stopped and deactivated the client, then tried to uninstall:

INFO: Uninstalling NextDNS...
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package nextdns
ERROR: uninstall: exit 0
c) Configure NextDNS
r) Remove NextDNS
e) Exit
Choice (default=c):