Clarify Linux port permission denial FAQ entry

Author: wilyJ80

bin/arduino-cli

@@ -43,11 +43,13 @@ when using a serial port, the monitor baud rate can be set to 4800 with the foll
 
 ## "Permission denied" error in sketch upload
 
-This can be solved by setting up serial port permission. This can be achieved through the following command:
+This problem might happen on some Linux systems, and can be solved by setting up serial port permissions. First, search for the port your board is connected to, with the command:
 
-`$ sudo usermod -a -G dialout <username>`
+`$ arduino-cli board list`
 
-Replace `<username>` with your user name. Logging out and logging in again is necessary for the changes to take effect.
+Then add your user to the group with the following command, replacing `<username>` with your username and `<group>` with your group name. Logging out and in again is necessary for the changes to take effect.
+
+`$ sudo usermod -a -G <group> <username>`
 
 ## Additional assistance