VMware Workstation Ubuntu 18.10 Full Screen Problem

I ran into the same issue on a fresh install of 18.10 on VMWare 15.01. If I manually restarted open-vm-tools after I logged in, everything worked. I tried to reinstall VMWare tools, it didn't help. This did fix it:

Edit this file using your preferred editing tool

/etc/systemd/system/multi-user.target.wants/open-vm-tools.service

Add these lines to the end of the "Unit" section

Requires=graphical.target
After=graphical.target

Save the file and the next time you restart you should be good to go.

You can apply the changes immediately without restarting by running

sudo systemctl daemon-reload
sudo service open-vm-tools restart