Troubleshooting

Error opening serial port error when uploading sketch

This means you need to set serial port permission

# Open terminal and type

ls -l /dev/ttyACM*

# Output will be similar to:
# crw-rw---- 1 root dialout 188, 0 5 apr 23.01 ttyACM0

# The "0" at the end of ACM might be a different number,
# or multiple entries might be returned. 
# The data we need is "dialout" 
# (is the group owner of the file). 

# Now we just need to add our user to the group:

sudo usermod -a -G dialout <username>

# where <username> is your Linux user name. 
# You will need to log out and log in again 
# for this change to take effect.