Unable to run calibre on Ubuntu VPS

[gourav]

I have a Contabo VPS with Ubuntu. I am trying to install Calibre on it. The installation completes successfully, but when I run calibre, I get the following error:

Traceback (most recent call last):
  File "runpy.py", line 194, in _run_module_as_main
  File "runpy.py", line 87, in _run_code
  File "site.py", line 45, in <module>
  File "site.py", line 41, in main
  File "calibre/gui_launch.py", line 72, in calibre
  File "bypy-importer.py", line 151, in exec_module
  File "calibre/gui2/__init__.py", line 16, in <module>
ImportError: cannot import name 'QApplication' from 'PyQt5.Qt' (/opt/calibre/lib/calibre-extensions/PyQt5.Qt.so)

Any idea how to resolve this issue?

[kovidgoyal]

You are probably missing needed X11 libraries. Use LD_DEBUG=libs for details.

[gourav]

I tried that and even that shows the same error.

I also tried reinstalling, and this time I noticed that it's giving the error at the time of installation itself:

____________________ WARNING ____________________
Setting up completion failed with error:
__________________________________________________


        Traceback (most recent call last):
          File "calibre/linux.py", line 832, in setup_completion
          File "calibre/linux.py", line 574, in write_completion
          File "bypy-importer.py", line 154, in exec_module
          File "calibre/gui2/__init__.py", line 16, in <module>
        ImportError: cannot import name 'QApplication' from 'PyQt5.Qt' (/opt/calibre/lib/calibre-extensions/PyQt5.Qt.so)

Setting up desktop integration...

____________________ WARNING ____________________
Setting up desktop integration failed with error:
__________________________________________________


        Traceback (most recent call last):
          File "calibre/linux.py", line 900, in setup_desktop_integration
          File "calibre/linux.py", line 885, in install_icons
          File "calibre/linux.py", line 875, in install_single_icon
          File "calibre/linux.py", line 1219, in render_img
        ImportError: cannot import name 'QImage' from 'PyQt5.Qt' (/opt/calibre/lib/calibre-extensions/PyQt5.Qt.so)