You are probably looking for something like lxml.

Please have a look at the lxml webpage

You can install it in ubuntu with

sudo apt-get install python-lxml

It's in the stdlib: http://docs.python.org/2/library/xml.etree.elementtree.html. No need to install it with pip.

There is no python-xml package in the repository. What made you decide you need a package with that specific name? Are you looking for python-lxml instead? This is the common Python XML library that I believe most people use.

I had a similar problem, and I fixed it this way on Ubuntu 20.04 with Python 3.1.8.

Go to the terminal and type these commands:

1. cd /home/user/.local/lib/python3.8/site-packages/lxml (Change the "user" keyword according to your system.)
2. mv etree.pyx etree.py  

You can do it manually by going to: 

/home/user/.local/lib/python3.8/site-packages/lxml 

and rename etree.pyx to etree.py.
Then try to import lxml.etree, and hopefully it will work for you.

Since you're on Ubuntu, don't bother with those source packages. Just install those development packages using apt-get.

apt-get install libxml2-dev libxslt1-dev python-dev

If you're happy with a possibly older version of lxml altogether though, you could try

apt-get install python-lxml

and be done with it. :)

Just do:

sudo apt-get install python-lxml

For Python 2 (e.g., required by Inkscape):

sudo apt-get install python2-lxml

If you are planning to install from source, then albertov's answer will help. But unless there is a reason, don't, just install it from the repository.