Comment 4 for bug 1416768

Running steam now on Kubuntu 15.10 I still get the lines:

"Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 77: non-double matrix element
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 77: wrong number of matrix elements
Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 85: saw unknown, expected number"

in console output (repeated twice, along with other errors/warnings). The fc-cache output doesn't show any errors though as you note.