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Access USB serial device in container

Create a udev rule on the host for all usb-serial devices. Set OWNER to your 1000 user.

cat << EOF | sudo tee /etc/udev/rules.d/50-usb-serial.rules
SUBSYSTEM=="tty", SUBSYSTEMS=="usb-serial", OWNER="jas"
EOF

Reload udev.

sudo udevadm control --reload-rules
sudo udevadm trigger

The serial device should now be owned by your user.

ls -l /dev/ttyUSB0
crw-rw----. 1 jas dialout 188, 0 Mar 15 11:09 /dev/ttyUSB0

You can now run minicom inside the toolbox container.

distrobox enter default
minicom -D /dev/ttyUSB0