/usr/share/texlive/release-texlive.txt is in texlive-base 2013.20140215-1ubuntu0.1.
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 7 8 | TeX Live (http://tug.org/texlive) version 2013
This file is public domain. It is read by install-tl --version,
tlmgr --version, and texconfig conf, and a final line appended with
the precise version number by tl-update-images during a build.
The following blank line at the end helps avoid confusing output when
used directly from svn, so don't delete it.
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