4.15.0-34.37) is not available, but a newer one is (4.15.0-46.49). We redirected you there.
/usr/bin/initex is in texlive-binaries 2013.20130729.30972-2ubuntu0.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/tex