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I had the same problem, this was the solution:

1. Go to arduino -> tools -> programmer -> Select Arduino as ISP

2. Upload using programmer

3. Upload an example code (pubsub is a good one to debug this kind of problems)

4. make sure your arduino exists:

   ls /dev/ttyACM0

5. make sure your user has access to dialout group:

   sudo adduser my_user_name dialout

run a roscore and rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=57600

I had the same problem, this was the solution:procedure solve it:

1. Go to arduino -> tools -> programmer -> Select Arduino as ISP

2. Upload using programmer

   ctrl + shitf + u (or click file -> upload using programmer)

3. Upload an example code (pubsub is a good one to debug this kind of problems)

   click file -> examples -> ros_lib -> pubsub

4. make sure your arduino exists:

   ls /dev/ttyACM0

5. make sure your user has access to dialout group:

   sudo adduser my_user_name dialout

I had the same problem, this procedure solve it:

1. Go to arduino -> tools -> programmer -> Select Arduino as ISP

2. Upload using programmer

   ctrl + shitf + u (or click file -> upload using programmer)

3. Upload an example code (pubsub is a good one to debug this kind of problems)

   click file -> examples -> ros_lib -> pubsub

4. make sure your arduino exists:

   ls /dev/ttyACM0

5. make sure your user has access to dialout group:

   sudo adduser my_user_name dialout

6. run

   roscore

   rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=57600

I had the same problem, this procedure solve it:

1. Go to arduino Arduino IDE -> tools -> programmer -> Select Select: Arduino as ISP

2. Upload using programmer

   ctrl + shitf + u (or click file -> upload using programmer)

3. Upload an example code (pubsub is a good one to debug this kind of problems)

   click file -> examples -> ros_lib -> pubsub

4. make sure your arduino exists:

   ls /dev/ttyACM0

5. make sure your user has access to dialout group:

   sudo adduser my_user_name dialout

6. run

   roscore

   rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=57600

I had the same problem, this procedure solve it:

1. Go to Arduino IDE -> tools Tools -> programmer Programmer -> Select: Arduino as ISP

2. Upload using programmer

   ctrl + shitf + u (or click file -> upload using programmer)

3. Upload an example code (pubsub is a good one to debug this kind of problems)

   click file -> examples -> ros_lib -> pubsub

4. make sure your arduino exists:

   ls /dev/ttyACM0

5. make sure your user has access to dialout group:

   sudo adduser my_user_name dialout

6. run

   roscore

   rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=57600