Fonts are located in directories /usr/share/fonts/ and ~/.fonts/.
List all fonts, pick the ones for the terminal:
fc-list | sort | grep -i monoSee how a font looks in the current console (use the font name, not the file name):
printf '\e]710;%s\007' "Ubuntu Mono:pixelsize=16"Edit .Xresources to apply the font for your terminal (say, urxvt):
URxvt*font: xft:Ubuntu Mono:pixelsize=16Reload the resources:
xrdb ~/.Xresources