[BertReader]

I find Calibre is great and does everything perfectly in Windows, but i have the same problem trying to use it on any of my Ubuntu installations, with error messages like this, when trying to import a book into my library:

1The_Empires_Crumble.pdf
Traceback (most recent call last):
File "/usr/lib/calibre/calibre/gui2/add.py", line 83, in run
title = self.add(id, opf, cover, name)
File "/usr/lib/calibre/calibre/gui2/add.py", line 128, in add
id = self.db.create_book_entry(mi, cover=cover, add_duplicates=False)
File "/usr/lib/calibre/calibre/library/database2.py", line 1371, in create_book_entry
(title, series_index, aus))
File "/usr/lib/calibre/calibre/library/sqlite.py", line 170, in run
raise DatabaseException(*res)
DatabaseException: no such function: uuid4
RemoteTraceback (most recent call last):
File "/usr/lib/calibre/calibre/library/sqlite.py", line 141, in run
ok, res = True, func(*args, **kwargs)
OperationalError: no such function: uuid4

The same request works fine in Windows. What can I do to troubleshoot?