ERROR   1410782828.95 optional_crypto:8     Using fallback for gmpy, not recommended as it hurts performance and is less tested
Traceback (most recent call last):
  File "Tribler/Main/tribler.py", line 28, in <module>
    run()
  File "Tribler/Main/tribler.py", line 24, in run
    from Tribler.Main.tribler_main import run as run_main
  File "/usr/share/tribler/Tribler/Main/tribler_main.py", line 64, in <module>
    from Tribler.Main.vwxGUI.MainFrame import FileDropTarget
  File "/usr/share/tribler/Tribler/Main/vwxGUI/MainFrame.py", line 45, in <module>
    from Tribler.Main.Dialogs.ConfirmationDialog import ConfirmationDialog
  File "/usr/share/tribler/Tribler/Main/Dialogs/ConfirmationDialog.py", line 2, in <module>
    from Tribler.Main.vwxGUI.widgets import _set_font
  File "/usr/share/tribler/Tribler/Main/vwxGUI/widgets.py", line 15, in <module>
    from Tribler.Main.vwxGUI.GuiUtility import GUIUtility
  File "/usr/share/tribler/Tribler/Main/vwxGUI/GuiUtility.py", line 26, in <module>
    from Tribler.Main.vwxGUI.SearchGridManager import TorrentManager, ChannelManager, LibraryManager
  File "/usr/share/tribler/Tribler/Main/vwxGUI/SearchGridManager.py", line 37, in <module>
    from Tribler.TrackerChecking.TorrentChecking import TorrentChecking
  File "/usr/share/tribler/Tribler/TrackerChecking/TorrentChecking.py", line 23, in <module>
    from Tribler.Core.Session import Session
  File "/usr/share/tribler/Tribler/Core/Session.py", line 12, in <module>
    from Tribler.Core.APIImplementation.LaunchManyCore import TriblerLaunchMany
  File "/usr/share/tribler/Tribler/Core/APIImplementation/LaunchManyCore.py", line 29, in <module>
    from Tribler.community.privatesemantic.crypto.elgamalcrypto import ElgamalCrypto
  File "/usr/share/tribler/Tribler/community/privatesemantic/crypto/elgamalcrypto.py", line 2, in <module>
    from Tribler.community.privatesemantic.crypto.ecutils import OpenSSLCurves
  File "/usr/share/tribler/Tribler/community/privatesemantic/crypto/ecutils.py", line 6, in <module>
    from pyasn1.type import univ, namedtype, tag
ImportError: No module named pyasn1.type