Troubleshooting installing dev version of lilypond on ubuntu

[Paul]

Hi all,
I've installed the latest lilypond dev version 2.19.42 on ubuntu 16.04 
following the instructions on the lilypond website:
http://lilypond.org/unix.html

namely with:
$ sh lilypond-2.19.42-1.linux-64.sh

But when I cd to my home directory and run
$ lilypond/usr/bin/lilypond test.ly

I get this warning and fatal error:

GNU LilyPond 2.19.42
Processing `test.ly'
Parsing...
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Layout output to `/tmp/lilypond-IqnFXX'...
Converting to `test.pdf'...
warning: `(gs -q -dSAFER -dDEVICEWIDTHPOINTS=595.28 
-dDEVICEHEIGHTPOINTS=841.89 -dCompatibilityLevel=1.4 -dNOPAUSE -dBATCH 
-r1200 -sDEVICE=pdfwrite -sOutputFile=test.pdf -c.setpdfwrite 
-f/tmp/lilypond-IqnFXX)' failed (256)

fatal error: failed files: "test.ly"

The test file is simply:
\version "2.19.42"
{ c d e f }

Any suggestions?  I also have lilypond 2.18.2 installed via the ubuntu 
software center (or maybe it was installed when I installed Frescobaldi 
via ubuntu software center, I forget) and it runs fine. The two versions 
are installed in different locations:

2.18.2:  /usr/bin/lilypond
2.19.42: ~/lilypond/usr/bin/lilypond

Thanks for any tips.  (I'm a new immigrant wandering wide-eyed through 
the twisted streets of GNU/Linux software installation procedures.)

-Paul