Change serial port permissions for Arduino to enable sketch upload.

enable-arduino-upload-linux.sh

# Error:
#   Loading configuration...
#   Initializing packages...
#   Preparing boards...
#   Verifying...
#   Sketch uses 4044 bytes (12%) of program storage space. Maximum is 32256 bytes.
#   Global variables use 407 bytes (19%) of dynamic memory, leaving 1641 bytes for local variables. Maximum is 2048 bytes.
#   Uploading...
#   An error occurred while uploading the sketch
#   avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied
#   [Error] Exit with code=1

ls -l /dev/ttyACM*
# Output:
# crw-rw---- 1 root dialout 166, 0 Mar  9 11:34 /dev/ttyACM0

sudo chmod a+rw /dev/ttyACM0
# Output:
# crw-rw-rw- 1 root dialout 166, 0 Mar  9 11:34 /dev/ttyACM0