$ LC_ALL=C click install dekko.dekkoproject_0.5.4_amd64.click --allow-unauthenticated
WARNING:root:Signature check failed, but installing anyway as requested
Cannot install dekko.dekkoproject_0.5.4_amd64.click: Cannot acquire permission to write to /opt/click.ubuntu.com; either run as root with --user, or use "pkcon install-local" instead
dpm@el-far:~/term-build$ LC_ALL=C sudo click install dekko.dekkoproject_0.5.4_amd64.click --allow-unauthenticated
[sudo] password for dpm: 
WARNING:root:Signature check failed, but installing anyway as requested
dekko.dekkoproject 0.5.4 has not been registered for any users.
It may be garbage-collected the next time the system starts.
To avoid this, use "click register".