Yeah... Good thing I happened to look in the thread... I saw three minutes had passed since that was posted...
What that would do is not just install libc3-i386... It would remove the 64bit build of Libc6, which would remove the essential compiler as a dependency.
This would autoremove the Zorin OS Desktop and most other essential packages.
OP was given a wrong advise to install a propitiatory driver from Synaptic (which is impossible). I was not fast enough to come to the thread to stop the disaster
Most don't, if you read them. They instead say to add i386 architecture, nothing more.
Some people wish to look knowledgeable and they guess. And so, bad advice ends up on the web.
Do a search and you can find bad advice about finding Bigfoot, too. Or bad advice about the Moon Landings (Apollo missions).
Or about taking ivermectin for Covid.
That bad advice exists on the web, does not give it legitimacy.
But... IF you are feeling scientific. You can conduct an experiment in your terminal right now... ( I wouldn't do that if I were you...)
It is tricky. 32 bit apps usually can be run no problem.
The thing to watch out for is when installing something needs to remove existing apps.
This is one good reason I always install from terminal. It Tells You.
It tells you if it needs to remove the Zorin OS Desktop Environment to install that thing you are trying to install. It has a confirmation dialog.
Gnome-Software does not. User @Frog has felt that pain first-hand.