What to do if such import error occurs? >>> import PySide >>> from PySide import QtCore Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: cannot import name QtCore 1. Try to locate where your pyside is installed: $ locate PySide ... /usr/lib/python2.7/dist-packages/PySide /usr/lib/python2.7/dist-packages/PySide/__init__.py /usr/lib/python2.7/dist-packages/PySide/__init__.pyc /usr/lib/python2.7/dist-packages/PySide/phonon.so /usr/lib/python2.7/dist-packages/PySide/QtCore.so /usr/lib/python2.7/dist-packages/PySide/QtDeclarative.so /usr/lib/python2.7/dist-packages/PySide/QtGui.so /usr/lib/python2.7/dist-packages/PySide/QtHelp.so ... Hint: use this to update your file index: $ sudo updatedb 2. The solution is easy: add this to your ~/.bashrc (or ~/.<shell>rc you actually have). export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/python2.7/dist-packages/PySide