I ran into this problem attempting to install Wine and never found a solution that worked, so I gave up. Now I have run into trying to install Calibre from the software store. I get this error:
Error while installing package: trying to overwrite shared '/etc/gtk-3.0/settings.ini', which is different from other instances of package libgtk-3-0t64
there been a solution found or is this a fatal flaw in Zorin and an indication it's time to change distros? I certainly hope not, as I really love this distro.
If you use timeshift, you could go back to your system state before you tried to install wine. This could be the most clean solution to repair the library conflict. As the standard of timeshift is, your home data are not included and this keeps your user data save. Please leave this standard setting as it is.
But if you don't have timeshift snaps, there are other possibilities for repair.
Leaving the beautiful Zorin OS is not needed and doesn't help as other debian - ubuntu based linux distros can run into the same library conflict.
To help you in the best way, please give us some info about your system under settings - system - info - system details.
Also important is how you had tried to install wine. Did you use the Zorin package from the software store? Please give us the output of:
dpkg -l | grep -i wine
Have you already removed Wine and/or Calibre? If not, please leave it installed until our experts can analyze the problem.
That error shows the installer is seeing two package builds that both claim /etc/gtk-3.0/settings.ini, rather than a general Zorin flaw; manually deleting the file could make the desktop settings inconsistent. A safe first check is apt-cache policy libgtk-3-0t64 libgtk-3-0, which will show whether the installed and candidate versions come from mismatched package sources before any repair is attempted.
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Due to the attempt at installing WINE, you might try removing the conflicty libdecor package, first:
sudo apt purge libdecor-0-plugin-1-gtk:i386
sudo apt autoremove --purge
sudo apt clean
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When You try it via Terminal with the Command sudo apt install calibre what Output do You get?