Never never never use Novice mode in Installer !!!!!
It is for expert users only. Always use advanced or expert mode. Novice mode does not ask you any questions but assumes everything is like it was at Commodore's test laboratory. You can assume that almost no Amiga out there works correctly with Novice mode.
And *never* unprotect the Workbench disks. If it asks you to do so, something is going wrong !!! No program needs to write to the original disks. If you want to write to it, use a backup copy.
Bye,
Thomas