Sometimes `./pmbootstrap.py flasher flash_kernel` can fail with an error message that includes "Failed (remote: data too large)". This might be solved by updating by reflashing [https://developers.google.com/android/images#hammerhead the latest version of the stock Android image for the device].
==== Useful aliases ====
# Turn off screen
# Restart lightdm (has no effect)
sudo rc-service lightdm restart