Calibre error on Ubuntu 20.04 - fix.

Here is the source blog post. I have copied the text below almost word for word and added some formatting for my own viewing. All credit to the original blog post author.

• open a terminal and issue the following

  calibre
  

• If we get the error below we need to edit a file – "server.py" to fix that.

  AttributeError: 'NoneType' object has no attribute 'cancel'
  

• Head to the directory, using cd command-line utility, where our server.py is stored.

  cd /usr/lib/calibre/calibre/utils/ipc/
  

• open the file server.py using a text-editor.

  sudo vim server.py
  

• We need to the edit the code from Line 110. So, it goes like this

  #self._listener._unlink.cancel()
  if self._listener._unlink is not None:
  self._listener._unlink.cancel()
  

• We have put a hash before the original code and subsequently appended the file with an "if" statement.

• Try running calibre again in terminal. It should now launch the application.

• In certain circumstances it may still throw an indentation error.

  if self._listener._unlink is not None:
                                   ^
  TabError: inconsistent use of tabs and spaces in indentation
  

• If so, use proper tabs and spaces at the beginning of the "self.listener.unlink.cancel()" code. It should resolve the issue.

#calibre #fix #ubuntu