Odyssey x86j4105 ubuntu 20.4 no /dev/ttyACM0 and no seeeduino listed under lsusb

Hi,
Have you ever burned a program to samd21 before, or are you just using it for the first time. Wouldn’t a quick reset samd21 twice in existence help? If that’ s the case, then maybe samd21 was not programmed with the firmware.