This may be of interest, re lock kernel via Synaptic: Zorin OS Update After Sept 6 '21 kernel 5.11.0-34 Black Screen - #37 by Aravisian
You will have to ask @FrenchPress to translate the Japanese screenshot though 
This may be of interest, re lock kernel via Synaptic: Zorin OS Update After Sept 6 '21 kernel 5.11.0-34 Black Screen - #37 by Aravisian
You will have to ask @FrenchPress to translate the Japanese screenshot though