6.2 error msg after in place update

[suzywong]

System 1. RPi3B (wired):- smooth in-place update from 6.1.0 to 6.2.0. System Info display does not have the message that Jon sees, but does take about 15 seconds to come up, whereas the About display is instantaneous. Both displays were instantaneous on 6.1.0.

System 2. RPiW (wireless):- As above.

System 3. RPI3B+ (wired):- As above.

But the good news is that the "Vintage iPad display" issue is fixed. Nice one!