Hello David,
You are right, Lilypond was installed but not visible.
I have read scary things about changing
~/.bashrc
like not to be able to login anymore.
So first I justed added the path manually. Of course this will be lost
after a reboot.
Lilypond 2.18.2 was visible and could be executed. After that I installed
Frescobaldi again with
sudo apt-get install frescobaldi
Frescobaldi installed lilypond 2.16.2 again. So i had to reverse.
After manually downloaded and install Frescobaldi again. And executed my
example. The result was still :
Starting lilypond 2.18.2 [test3.ly]...
Processing `/tmp/frescobaldi-CgvCtP/tmpYKvR5j/test3.ly'
Parsing...
/tmp/frescobaldi-CgvCtP/tmpYKvR5j/test3.ly:10:47: error: GUILE signaled an
error for the expression beginning here
\override StaffSymbol.line-count = #2 #
generate syntax error