You can connect form an Ubuntu 22.04 host as:
screen /dev/ttyACM0 115200
When in screen, you can Ctrl + C to kill, and then execution stops and you are left in a Python shell. From there:
  • Ctrl + D: reboots
  • Ctrl + A K: kills the GNU screen window. Execution continues normally
but be aware of: Raspberry Pi Pico W freezes a few seconds after after screen disconnects from UART.
The first/only way Ciro could find was with ampy: That just worked and it worked perfectly!
python3 -m pip install --user adafruit-ampy
ampy --port /dev/ttyACM0 run
TODO: possible with rshell?
Install on Ubuntu 22.04:
python3 -m pip install --user adafruit-ampy
Ctrl + X. Documented by running help repl from the main shell.
Our examples at: rpi-pico-w/upython.
The examples can be run as described at Program Raspberry Pi Pico W with MicroPython.
Ubuntu 22.04 build just worked, nice! Much feels much cleaner than the Micro Bit C setup:
sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib

git clone
cd pico-sdk
git checkout 2e6142b15b8a75c1227dd3edbe839193b2bf9041
cd ..

git clone
cd pico-examples
git checkout a7ad17156bf60842ee55c8f86cd39e9cd7427c1d
cd ..

export PICO_SDK_PATH="$(pwd)/pico-sdk"
cd pico-exampes
mkdir build
cd build
# Board selection.
# also says you can give wifi ID and password here for W.
cmake -DPICO_BOARD=pico_w ..
make -j
Then we install the programs just like any other UF2 but plugging it in with BOOTSEL pressed and copying the UF2 over, e.g.:
cp pico_w/blink/picow_blink.uf2 /media/$USER/RPI-RP2/
Note that there is a separate example for the W and non W LED, for non-W it is:
cp blink/blink.uf2 /media/$USER/RPI-RP2/
Also tested the UART over USB example:
cp hello_world/usb/hello_usb.uf2 /media/$USER/RPI-RP2/
You can then see the UART messages with:
screen /dev/ttyACM0 115200
TODO understand the proper debug setup, and a flash setup that doesn't require us to plug out and replug the thing every two seconds. appears to describe it, with SWD to do both debug and flash. To do it, you seem need another board with GPIO, e.g. a Raspberry Pi, the laptop alone is not enough.

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