Looking at `ss-5.pdf`, I saw the same rendering issue. The problem
appears to be associated with font substitution. In particular,
CourierStd is replaced with Ubuntu, which obviously won't render
properly.
I was able to correct
CourierStd is not defined in any of the config files at
`/etc/fonts/conf.d`, so it falls back to sans-serif, not monospace. On
my computer, the sans-serif fallback is set to Ubuntu.
In config files at `/etc/fonts/conf.d`, creating duplicate rules for
"CourierStd" each time "Courier" or "Courier Ne
