Installed linux-image-5.11.0-34-generic from proposed. It seems to fix the issue with graphics distortion from the decryption prompt onwards. Unfortunately it doesn't work very well after that. There is a message on the screen about something having failed and automatic reporting being enabled. There is no desktop. If I log in, there are no NICs, so something is fundamentally wrong.
Installed linux-image- 5.11.0- 34-generic from proposed. It seems to fix the issue with graphics distortion from the decryption prompt onwards. Unfortunately it doesn't work very well after that. There is a message on the screen about something having failed and automatic reporting being enabled. There is no desktop. If I log in, there are no NICs, so something is fundamentally wrong.