This days, with 4K monitors, the linux console is unreadable : the font is too small. So how can we scale the font size in the console after boot ?
Just modify the default console setup file for a bigger font :
> cat /etc/default/console-setup
ACTIVE_CONSOLES="/dev/tty[1-6]"
CHARMAP="UTF-8"
CODESET="guess"
FONTFACE="Terminus"
FONTSIZE="16x32"
FONT='Lat7-Terminus32x16'