Per-PC font sizes, etc

My home network has NFS homedirs, and so it doesn't matter which computer or laptop family members log into. They get all their files.

Now, one of the PC's has a 40 inch monitor, and users prefer a text-scaling-factor of 2 when using that PC.

Changing their personal settings means changing it back again; fortunately a system-wide default of 2 can be set on that PC, and apply to all users that don't override the system value.

Edit the text-scaling-factor in the schema:
sudo nano /usr/share/glib-2.0/schemas/org.gnome.desktop.interface.gschema.xml

and rebuild the schema:
sudo glib-compile-schemas /usr/share/glib-2.0/schemas

[from http://askubuntu.com/a/470253]

And then to reset the users custom value (if any):

gsettings reset org.gnome.desktop.interface text-scaling-factor
[from http://askubuntu.com/questions/60044/how-do-i-change-the-font-dpi-settings]

But doing the same for org.cinnamon.desktop as I do for org.gnome.desktop

text-scaling-factor
scaling-factor
cursor-size

Also default-zoom-level to larger and default-use-tighter-layouts to true, in /usr/share/glib-2.0/schemas/org.nemo.gschema.xml