/usr/share/vim/vim80/indent/mf.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | " METAFONT indent file
" Language: METAFONT
" Maintainer: Nicola Vitacolonna <nvitacolonna@gmail.com>
" Last Change: 2016 Oct 1
runtime! indent/mp.vim
|