When compiling sketch for esp32 have ModuleNotFoundError 'serial'

[inchoxd]

Hi, when i compiling sketch for esp32 on Ubuntu20.04 have error below.

$ arduino-cli compile --fqbn esp32:esp32:m5stack_cores3

Traceback (most recent call last):
  File "/home/inchoxd/.arduino15/packages/esp32/tools/esptool_py/4.6/esptool.py", line 34, in <module>
    import esptool
  File "/home/inchoxd/.arduino15/packages/esp32/tools/esptool_py/4.6/esptool/__init__.py", line 41, in <module>
    from esptool.cmds import (
    ...<24 lines>...
    )
  File "/home/inchoxd/.arduino15/packages/esp32/tools/esptool_py/4.6/esptool/cmds.py", line 14, in <module>
    from .bin_image import ELFFile, ImageSegment, LoadFirmwareImage
  File "/home/inchoxd/.arduino15/packages/esp32/tools/esptool_py/4.6/esptool/bin_image.py", line 14, in <module>
    from .loader import ESPLoader
  File "/home/inchoxd/.arduino15/packages/esp32/tools/esptool_py/4.6/esptool/loader.py", line 30, in <module>
    import serial
ModuleNotFoundError: No module named 'serial'

Used platform Version Path
esp32:esp32   3.0.5   /home/inchoxd/.arduino15/packages/esp32/hardware/esp32/3.0.5
Error during build: exit status 1

esptool and pyserial are already installed from pip, serial is not install.

When I run python -c "import serial", it was no error.
Plese tell me how to solve it.

[ptillisch]

Hi @inchoxd. Try running this command:

python3 -m pip install pyserial

The esp32:esp32 platform uses python3, not python, so your test using python was not conclusive proof that the pyserial package is available for use by python3.

[kenb4]

Alternate suggestion for Debian/Ubuntu

sudo apt install python3-serial

[inchoxd]

Hi @ptillisch. Tried your posts, it was solved. THX.
My python enviroment is pyenv, so it was little defficult. What I have done below.

1. python3 -m pip install pyserial but externally-managed-environment error occureded.
2. python3 -m pip install pyserial --break-system-package it was completely install and without error when run arduino-cli compile ....

[ptillisch]

You are welcome. I'm glad it is working now. Thanks for taking the time to post an update with your findings!

Regards, Per