DataStax OpsCenter 5.1.0 fails to start due to python 'ImportError' <p>Trying to start a tarball installation of OpsCenter 5.1.0 on Ubuntu 14.04 64-bit by running ./opscenter in /opt/opscenter-5.1.0/bin fails with the following error:</p> <p><code>Traceback (most recent call last): File "./bin/twistd", line 28, in &lt;module&gt; from twisted.scripts.twistd import run ImportError: cannot import name run</code></p> <p>My version of python is 2.7.6:<br> <code>$ python --version Python 2.7.6</code></p> <p>And trying to import twisted results in:<br> <code>$ python -c "import twisted; print twisted" Traceback (most recent call last): File "&lt;string&gt;", line 1, in &lt;module&gt; ImportError: No module named twisted</code></p> <p>The value of PYTHONPATH from opscenter looks as follows:<br> <code>PYTHONPATH: ./src:/usr/lib/python2.7/site-packages:./src/lib/python2.7/site-packages:./lib/python2.7/site-packages:./lib/py:./lib/py-debian/2.7/amd64::</code></p> <p>What is going wrong here and can someone suggest a workaround that is worth trying to a Python newbie?</p>