/usr/share/mythbuntu/examples/exports.dist is in mythbuntu-common 0.72.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | /var/lib/mythtv/recordings *(ro,async,no_root_squash,no_subtree_check)
/var/lib/mythtv/videos *(ro,async,no_root_squash,no_subtree_check)
/var/lib/mythtv/music *(ro,async,no_root_squash,no_subtree_check)
/var/lib/mythtv/pictures *(ro,async,no_root_squash,no_subtree_check)
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