does anyone recognise the UI element displaying this on tty1?
   It happened for maybe half an hour today on raspbian.  Systemd was in
   graphical mode, but I mostly use the ttys.  I haven't seen it before or
   since.
   [1]https://youtu.be/TPKA_xgI8_8
   note: if using youtube, we should move to freer alternatives, I think
   one might have been called peertube? unsure.
   Figuring out the unexpected system behaviors I experience seems good.
   Let me know if there are threads on this list I should be catching up
   on and replying to.  It's hard to cover them all.

References

   1. https://youtu.be/TPKA_xgI8_8