I really love the “fixed” bitmap font family on Linux. It is readable at a much smaller size than any TrueType font I have found. Compare:
To enable this font in Xterm, add the following to your ~/.Xresources:
XTerm*font: -*-fixed-medium-r-*-*-13-*-*-*-*-60-iso10646-1
XTerm*boldFont: -*-fixed-medium-r-*-*-13-*-*-*-*-60-iso10646-1
On Ubuntu, all bitmapped fonts are disabled by default in fontconfig, so it is not possible to use this font in, say, gnome-terminal or xfce4-terminal. To enable this font, you must do the following, courtesy of cpitchford on Ubuntu Forums:
$ sudo su
$ cat > /etc/fonts/conf.avail/69-fixed-bitmaps.conf <<EOF
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Enabled Fixed bitmap fonts -->
<selectfont>
<acceptfont>
<pattern>
<patelt name="family">
<string>Fixed</string>
</patelt>
</pattern>
</acceptfont>
</selectfont>
</fontconfig>
EOF
$ ln -s ../conf.avail/69-fixed-bitmaps.conf /etc/fonts/conf.d/
$ dpkg-reconfigure fontconfig-config
$ dpkg-reconfigure fontconfig
And then restart X. Presto!