Following failed upgrade from Lite 15.x to 16.3 Zorin incorrectly reports 16.3

Following failed upgrade from Lite 15.3 to 16.3 Zorin incorrectly reports 16.3. Consequently an upgrade is no longer possible. I have run:
sudo apt --fix-broken install
sudo dpkg --configure -a
sudo apt update
sudo apt full-upgrade
sudo apt clean

Despite this, when rebooting grub loads the 15.3 version image. I would be grateful for any help or advice.

Can you please clarify this?

Are you saying that at grub, it looks the same as 15? But upon reaching the desktop, the os-release states it is 16?
Or, are you saying that from grub through the desktop, it looks the same as 15, but os-release reports it erroneously as 16?

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