You can install PySide2 like so:

apt-get update
apt-get install -y software-properties-common
add-apt-repository -y ppa:thopiekar/pyside-git
apt-get update
apt-get install -y python
apt-get install -y python-dev
apt-get install -y python-pyside2

But how do you install the pyside2-uic executable along with its dependencies (the pyside2uic Python module)?

  • 2
    The line apt-get add-apt-repository -y ppa:thopiekar/pyside-git should read add-apt-repository -y ppa:thopiekar/pyside-git on Ubuntu 16.04. Sep 14 '17 at 14:07

The pyside2-uic file is provided by the pyside2-tools package from the PPA you gave. Therefore, you install pyside2-tools using:

sudo apt-get install pyside2-tools
  • Thanks. Any idea on how to fix the following when you execute pyside2-uic? Traceback (most recent call last): File "/usr/bin/pyside2-uic", line 28, in <module> from pyside2uic.driver import Driver ImportError: No module named pyside2uic.driver I think it's because the pyside2uic Python module isn't installed.
    – fredrik
    Sep 18 '16 at 10:01
  • That is odd. The pyside2-tools package does have driver.py, so the module exists.
    – edwinksl
    Sep 18 '16 at 10:10
  • Also, I noticed in your post you tried to install python-pyside2 but I don't think that package exists in the Ubuntu repos nor in the PPA you are using. I think you meant to install pyside2, which is provided by the PPA. Maybe this is related to the problem you have; I am not sure.
    – edwinksl
    Sep 18 '16 at 10:11
  • I'm using this to differentiate between python-pyside2 and python3-pyside2 and it seems to work well eventhough I see the package is called pyside2 in the PPA. However, nothing besides the PySide2 module exists in my /usr/lib/python2.7/dist-packages. If I attempt apt-get install pyside2 I get Unable to locate package pyside2. Hmmm... I really wonder what happened to the pyside2uic package.
    – fredrik
    Sep 18 '16 at 10:22
  • I think I found what's causing issues for me: pastebin.com/UyCKiPRM
    – fredrik
    Sep 18 '16 at 10:28


  • Install pyside2-tools.

    sudo apt-get install pyside2-tools
  • Force pyside2-uic to run as a Python 3 script.

    • Manually edit /usr/bin/pyside2-uic as the superuser with your favourite religious-war text editor – in my case, vim.

      sudo vim /usr/bin/pyside2-uic
    • Edit the first line to read:

      #! /usr/bin/python3



Installing pyside2-tools without manually editing /usr/bin/pyside2-uic as suggested by edwinksl's prior answer results in a fatal exception on running pyside2-uic:

$ pyside2-uic
Traceback (most recent call last):
  File "/usr/bin/pyside2-uic", line 28, in <module>
    from pyside2uic.driver import Driver
ImportError: No module named pyside2uic.driver

The reason why appears to be that the PySide2 PPA installs the pyside2uic package for Python 3 but not Python 2.

Even if this PPA did correctly install the pyside2uic package for both, however, the resulting pyside2-uic script would still only be usable by Python 2 users. Python 3 users would be hung out to dry. Since Python 2 is nearing its end-of-life, that would be bad.

Ultimately, the only viable long-term solution is for this PPA to provide two different packages:

  • python3-pyside-tools, providing Python 3-specific PySide 2 utilities with Python 3-specific filenames (e.g., /usr/bin/pyside2-uic-py3).
  • python2-pyside-tools, providing Python 2-specific PySide 2 utilities with Python 2-specific filenames (e.g., /usr/bin/pyside2-uic-py2).

Python 2 and 3 are two distinct languages. You gotta keep 'em separated.

Until that wondrous day, the above solution will have to do. Thanks for all the PySide 2 packaging, Thomas Karl Pietrowski .

  • I get the following error, running pyside2-uic with python3 on Ubuntu 16.04: ImportError: No module named 'PySide2' Also it seems pyside2 is not provided for python3 with this ppa.
    – Chris
    Jun 20 '19 at 7:54

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