problems updating in 8.04

Hi:

when I try to update the distribution I get the following:

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
  jockey-common jockey-gtk
2 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
3 not fully installed or removed.
Need to get 0B/46.1kB of archives.
After this operation, 4096B of additional disk space will be used.
Do you want to continue [Y/n]? y
(Reading database ... 123762 files and directories currently installed.)
Preparing to replace jockey-gtk 0.2-0ubuntu4 (using .../jockey-gtk_0.2-0ubuntu5_all.deb) ...
Unpacking replacement jockey-gtk ...
Preparing to replace jockey-common 0.2-0ubuntu4 (using .../jockey-common_0.2-0ubuntu5_all.deb) ...
Unpacking replacement jockey-common ...
Setting up python-apt (0.7.4ubuntu5) ...
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1593, in <module>
    main()
  File "/usr/bin/pycentral", line 1587, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 982, in run
    self.pkg.byte_compile(bc_option, self.options.exclude)
  File "/usr/bin/pycentral", line 624, in byte_compile
    rt.byte_compile(files, bc_option, exclude_regex)
AttributeError: 'NoneType' object has no attribute 'byte_compile'
dpkg: error processing python-apt (--configure):
 subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of update-manager-core:
 update-manager-core depends on python-apt (>= 0.7.4ubuntu5); however:
  Package python-apt is not configured yet.
dpkg: error processing update-manager-core (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of update-manager:
 update-manager depends on update-manager-core (= 1:0.87.8); however:
  Package update-manager-core is not configured yet.
dpkg: error processing update-manager (--configure):
 dependency problems - leaving unconfigured
Setting up jockey-common (0.2-0ubuntu5) ...
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1593, in <module>
    main()
  File "/usr/bin/pycentral", line 1587, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 982, in run
    self.pkg.byte_compile(bc_option, self.options.exclude)
  File "/usr/bin/pycentral", line 627, in byte_compile
    (self.default_runtime.version, len(self.private_files)))
TypeError: int argument required
dpkg: error processing jockey-common (--configure):
 subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of jockey-gtk:
 jockey-gtk depends on jockey-common (= 0.2-0ubuntu5); however:
  Package jockey-common is not configured yet.
dpkg: error processing jockey-gtk (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 python-apt
 update-manager-core
 update-manager
 jockey-common
 jockey-gtk
E: Sub-process /usr/bin/dpkg returned an error code (1)

thanks