> Reading package lists... Done Building dependency tree        Reading
> state information... Done uniconf-tools is already the newest version
> (4.6.1-7). 0 upgraded, 0 newly installed, 0 to remove and 16 not
> upgraded. 4 not fully installed or removed. After this operation, 0 B
> of additional disk space will be used. Do you want to continue? [Y/n]
> y Setting up update-notifier-common (3.168.5) ... Traceback (most
> recent call last):   File
> "/usr/lib/update-notifier/package-data-downloader", line 24, in
> <module>
>     import debian.deb822   File "/usr/lib/python3/dist-packages/debian/deb822.py", line 38, in
> <module>
>     import chardet ImportError: No module named 'chardet' dpkg: error processing package update-notifier-common (--configure):  subprocess
> installed post-installation script returned error exit status 1 dpkg:
> dependency problems prevent configuration of update-notifier:
> update-notifier depends on update-notifier-common (= 3.168.5);
> however:   Package update-notifier-common is not configured yet.
>
> dpkg: error processing package update-notifier (--configure):
> dependency problems - leaving unconfigured dpkg: dependency problems
> prevent configuration of update-manager:  update-manager depends on
> update-notifier; however:   Package update-notifier is not configured
> yet.
>
> dpkg: error processing package update-manager (--configure):
> dependency problems - leaving unconfigured dpkg: dependency problems
> prevent configuration of ubuntu-release-upgrader-gtk:
> ubuntu-release-upgrader-gtk depends on update-manager; however:
> Package update-manager is not configured yet.
>
> dpkg: error processing package ubuntu-release-upgrader-gtk
> (--configure):  dependency problems - leaving unconfigured No apport
> report written because the error message indicates its a followup
> error from a previous failure.
>                           No apport report written because the error message indicates its a followup error from a previous failure.
>                                                     No apport report written because MaxReports is reached already
>                                   Errors were encountered while processing:  update-notifier-common  update-notifier  update-manager
> ubuntu-release-upgrader-gtk E: Sub-process /usr/bin/dpkg returned an
> error code (1)

I have tried to solve this problem by this command: sudo apt-get --reinstall install python-debian
but the error comes again and i can not proceed