Installed arp-scan on a friend's machine.
When I use it on my machine,
arp-scan -l -I en#
Produces a list as expected.
When I use it on friend's machine, I get
ERROR: Could not find interface: en#
ERROR: Check that the interface exists and is up
However when I
sudo arp-scan -l -I en#
Appears to be a permissions error, but I can't find where. Any suggestions?