The presentation mode did the trick for now.
Someone who is not aware of that new feature may have a bit of a
frustrating day when doing a similar install on an external HDD
The thing is that this was all done while using a Live USB on another
USB slot :-)
The Wifi of the old box doesn't
You can disable the screen blanking with
xset s off -dpms
Feel free to add that to the autostart of any installed system you want
to disable this default 'feature'. This was important back in the CRT
monitor days, but is less needed in the current LCD monitor days.
Laptops do not have CRT
Might it be possible to
turn ON, presentation mode, when the installer runs?
When installing Lubuntu to a USB connected HDD (using the normal
installer) then the sleepmode or screensaver mode, seems to try to mount
the usb drive on wakup. This apperently disrupts the installer errors
popup