Hi guys! I want to play an old game from GOG.com and it doesn't start. After some googling, I realized the problem is missing libjson 32 bit libraries on the system.
But I can't install it in any way. One user on the gog forum solved it by typing libjson0:i386 but Zorin says it's "Unable to locate package libjson0:i386".
You should not revert it since you still need it.
The command @337harvey gave you enables installing the 32bit libraries which you did not proceed to do after running the command and updating the sources.
But - to answer your question, you can revert with:
sudo dpkg --remove-architecture i386
As far as installing the libjson - this thread recommends not installing directly, but instead, moving the files in manually: