I have disabled the automatic boot into Unity and am booting into a CLI tty with a login shell. While running the CLI login shell the screen resolution is fairly low and only utilizes a tiny portion of my widescreen. I do want to maximise the screen resolution but keep the fonts small. I am actually running this particular install in a virtual machine inside VirtualBox but will also apply it later to other "bare metal" installs on other machines.
You can change the console resolution via GRUB configuration.
In the file
You can now restart your system.
N.B: I have not checked this solution myself, but it should work fine.
You can use Grub Customizer, a GUI method.
First, you need to install Grub Customizer. Open a terminal (Ctrl+Alt+T) and enter the following commands, one at a time.
The first command will prompt for your password. When the commands are complete, you can close the terminal.
Now you can make your changes.
Note: Changing the font is a little buggy, so you may want to avoid doing that.
This link has a list of modes you can set in boot time, check them by booting with the shift key (so you can enter grub) and in the kernel line add the vga parameter.