/usr/share/vim/vim80/keymap/thaana.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 | if &enc == 'utf-8'
source <sfile>:p:h/thaana-phonetic_utf-8.vim
endif
|