Bug#895868: munin-cron: Fontconfig error: failed reading config file

[Stephen Monteith]

The error appears to be coming from fontconfig as other programs are 
giving this error.  In the folder /etc/fonts/conf.d there are symbolic 
links to directories in /etc/fonts/conf.avail which is causing 
fontconfig to throw an error for each directory. Removing these 
directory symbolic links solve the problem for me.