Comment 14 for bug 24261

I had the problem described in this report.

A little investigation showed that the errant 'mfw' line was in
/etc/texmf/fmt.d/99postinf.cnf.

The wording at the top of that file is informative.

#####################################################################
#
# /etc/texmf/fmt.d/99postinst.cnf
#
# This file has been generated by tetex-bin's postinst script.
# teTeX no longer uses /etc/texmf/fmtutil.cnf for its configuration,
# but rather a file in /var/lib/texmf/web2c that is generated from
# configuration files in /etc/texmf/fmt.d.
#
# The postinst script detected that your old fmtutil.cnf contained
# lines that you seem to have added manually. In order to include those
# lines in the generated file, they have been extracted to this file,
# /etc/texmf/fmt.d/99postinst.cnf.
#
# You can add changes here, or in a new file in this directory, see
# the manpage of /usr/sbin/update-fmtutil(8). Note that if there are two
entries
# for a format, the second wins - because this file has number 99,
# it's entries will always be last
#
#####################################################################

I hope this helps you solve this problem.

Jules Bean