Upgrade ends with FAILED TO BOOTSTRAP

@Falco - Thanks for your response and explanation. What does it mean

? Did I do something wrong? My steps:

  • I started the update in admin/upgrade. There were several components to update, but only Docker was clickable (green).
  • It was successful, but without instructions on how to proceed. Refresh displayed the instructions from step 2.
  • I did that with this unhappy result. :confused: