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/usr/bin/ckeygen3 is in python3-twisted-experimental 13.2.0-0ubuntu1.

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#! /usr/bin/python3
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

import sys, os
extra = os.path.dirname(os.path.dirname(sys.argv[0]))
sys.path.insert(0, extra)
try:
    import _preamble
except ImportError:
    sys.exc_clear()
sys.path.remove(extra)

from twisted.conch.scripts.ckeygen import run
run()