I am using Ubuntu 16.04 64-bit. I tried to install VMware on Ubuntu 16.04 and I also installed some other GTK versions.

| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
ii  libgtk-3-0:amd 3.18.9-1ubun amd64        GTK+ graphical user interface lib
ii  libgtk2.0-0:am 2.24.30-1ubu amd64        GTK+ graphical user interface lib
ii  libgtk2.0-0:i3 2.24.30-1ubu i386         GTK+ graphical user interface lib

These are my laptop specs (Asus X751L):

description: CPU
          product: Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz
          bus info: cpu@0
          version: Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz
          capabilities: x86-64

How can I restore to the default GTK version? Or which one is the best to keep?


GTK2 and GTK3 can be installed independently.
There are apps those require GTK2 and those require GTK3.
So you may want to keep both of those.

You have a 64-bit OS.
The amd64 packages are needed for 64-bit applications.
The i386 packages are need for 32-bit applications.
If you don't have any 32-bit applications installed, you may safely uninstall the i386 version.
Although there is no harm in keeping all of those.

I am assuming that you have not installed an unsupported version of GTK using PPA's.
If you installed them from official repos, everything is fine.

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