[IreneDelse]

I've had the same problem, and my version of python is 2.5.2.

~$ sudo calibre_postinstall
Trying to setup udev rules...
 * Restarting Hardware abstraction layer hald                            [ OK ] 
Setting up bash completion... failed
Traceback (most recent call last):
  File "build/bdist.linux-i686/egg/calibre/linux.py", line 168, in setup_completion
  File "build/bdist.linux-i686/egg/calibre/gui2/lrf_renderer/main.py", line 1, in <module>
  File "build/bdist.linux-i686/egg/calibre/gui2/library.py", line 18, in <module>
  File "build/bdist.linux-i686/egg/calibre/library/database.py", line 11, in <module>
  File "build/bdist.linux-i686/egg/calibre/ebooks/metadata/meta.py", line 11, in <module>
  File "build/bdist.linux-i686/egg/calibre/ebooks/metadata/lit.py", line 12, in <module>
  File "build/bdist.linux-i686/egg/calibre/ebooks/lit/reader.py", line 371, in <module>
  File "build/bdist.linux-i686/egg/calibre/ebooks/lit/reader.py", line 374, in LitReader
TypeError: 'resolve_entities' is an invalid keyword argument for this function
Traceback (most recent call last):
  File "/usr/bin/calibre_postinstall", line 8, in <module>
    load_entry_point('calibre==0.4.89', 'console_scripts', 'calibre_postinstall')()
  File "build/bdist.linux-i686/egg/calibre/linux.py", line 430, in post_install
  File "build/bdist.linux-i686/egg/calibre/linux.py", line 304, in setup_completion
UnboundLocalError: local variable 'manifest' referenced before assignment

I run Ubuntu Hardy. Maybe I'll just wait the release of Ibex.