Install the package lmodern:
sudo apt-get install lmodern
Added to LilyDev only one month ago:
https://github.com/fedelibre/LilyDev/commit/2d4ed72d0d0a5f1b73b71d80489524c624e5727f
I am confused here.
Had John not used LilyDev but followed the documented CG instructions
for whatever Linux distribution - had he had one already installed -
then he wouldn't have hit this issue I suspect, I say that as someone
who compiles doc most days on both Ubuntu and Fedora and have tested
and documented all the instructions for all the distributions listed
in the CG and on my own 'at home' Fedora install I don't see any
'modern' fonts installed if I run the command:
fc-list | grep modern
(or 'grep lm')
I can also see that the XeteX package listed in Debian's repos shows
lmodern as 'recommended' however on my own system I have
texlive-xetex installed and yet I still don't see lmodern installed,
so it must not be a dep on Fedora either.
lmodern is not a req as far as I can tell.
So what is special about LilyDev?