I tried following the steps here: Set a specific screen resolution with xrandr
..but I do not have the
/etc/xdg/lxsession/LXDE/folder. Instead I have
/etc/xdg/lxsession/Lubuntu which does contain an autostart file, but after editing it and rebooting there was no change.
Here is another SE post that does reference the
/etc/xdg/lxsession/Lubuntu but the user there also could not get a custom resolution set: https://unix.stackexchange.com/questions/130976/lubuntu-display-resolution-virtualbox
Here's what I'm trying in the text of /etc/xdg/lxsession/Lubuntu/autostart
xrandr --auto --primary --mode --1920x1080
I'm running Lubuntu 17.10 in VMware Workstation.