/usr/share/matplotlib/mpl-data/fonts/afm/ is in python-matplotlib-data 2.1.1-2ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/matplotlib/mpl-data/fonts/afm/cmex10.afm
/usr/share/matplotlib/mpl-data/fonts/afm/cmmi10.afm
/usr/share/matplotlib/mpl-data/fonts/afm/cmr10.afm
/usr/share/matplotlib/mpl-data/fonts/afm/cmsy10.afm
/usr/share/matplotlib/mpl-data/fonts/afm/cmtt10.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pagd8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pagdo8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pagk8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pagko8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pbkd8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pbkdi8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pbkl8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pbkli8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pcrb8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pcrbo8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pcrr8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pcrro8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvb8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvb8an.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvbo8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvbo8an.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvl8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvlo8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvr8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvr8an.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvro8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/phvro8an.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pncb8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pncbi8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pncr8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pncri8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pplb8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pplbi8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pplr8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pplri8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/psyr.afm
/usr/share/matplotlib/mpl-data/fonts/afm/ptmb8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/ptmbi8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/ptmr8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/ptmri8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/putb8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/putbi8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/putr8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/putri8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pzcmi8a.afm
/usr/share/matplotlib/mpl-data/fonts/afm/pzdr.afm