/usr/share/mercurial/hgext.rc.md5sums is in mercurial 4.5.3-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | 4c808ced6b7ddc2e3c1514703bc238b9 0.9.5-3
80086669df3007b5b17d7d12efe03775 sarge
|