Just a friendly FYI.
When exploring some of the .desktop files in /usr/share/, I found that the /usr/share/zorin/applications/texdoctk.desktop file pointed to a missing executable in /usr/bin.
The executable is "texdoc" of course, apparently providing easy access to package documentation, and is a Comprehensive TeX Archive Network package included in the texlive-base package.
A simple install of texlive-base remedies the orphaned shortcut/link. That said, it's a rather large install for such a small issue.
Edit:
Running the new texdoctk executable reveals another small dependency problem: we need perl-tk to run the GUI. Installed pTk, and texdoctk's GUI seems to be happy.