(xenial)mouses@localhost:~$ which python
/usr/bin/python
(xenial)mouses@localhost:~$ python
python      python2.7   python3.5   python3m
python2     python3     python3.5m
(xenial)mouses@localhost:~$ python
python      python2.7   python3.5   python3m
python2     python3     python3.5m
(xenial)mouses@localhost:~$ sudo apt install python-twisted python-pyside
[sudo] password for mouses:
Reading package lists... Done
Building dependency tree
Reading state information... Done
python-pyside is already the newest version (1.2.2-2build2).
python-twisted is already the newest version (16.0.0-1ubuntu0.2).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
(xenial)mouses@localhost:~$ syncplay
Could not import GUI libraries. If you do not have PySide installed then you will need to install it for the GUI to work.