[lukas@lukas-20217 ~]$ sudo arduino --group==uucp
[sudo] password for lukas:
Picked up JAVA_TOOL_OPTIONS:
Error: unknown option: --group==uucp
[lukas@lukas-20217 ~]$
something not right…
or sudo -group==uucp arduino? – will check
sudo -g uucp arduino 
this form work , but the same:
avrdude: ser_open(): can’t open device “/dev/ttyACM0”: Permission denied