/usr/lib/python2.6/dist-packages/bzrlib/plugins/gtk/branchview/linegraph.py is in bzr-gtk 0.103.0+bzr792-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/bzrlib/plugins/gtk/branchview/../../../../../../../share/pyshared/bzrlib/plugins/gtk/branchview/linegraph.py