Software Updater error

[ronan]

I just installed Zorin OS 18 and I am getting this error. I am new to Linux so I don't have a good understanding of what it is.
It says I need to install the GTK graphical user interface library but when I install now it says the package system is broken.

after trying to install:

Thanks for the help

[Aravisian]

Can you run

sudo apt remove --purge libdecor-0-plugin-1-gtk:i386

In terminal, then run

sudo apt --fix-broken install

[irkp12]

terminal:
$sudo apt-get install -f