Comment 22 for bug 1768379

hello Łukasz Zemczak
i am new in Ubuntu. but i have the same problem. could you help me resolve it?

I have Ubuntu 18.04 and python3.6. And few apps which cant work without solving this bug.

При обработке следующих пакетов произошли ошибки:
 python3
 update-notifier-common
 gnome-shell
 update-notifier
 gnome-menus
E: Sub-process /usr/bin/dpkg returned an error code (1)

i have added -proposed repository. When i try upgrade i have this mistake: installed python3 package post-installation script subprocess returned error exit status 4
 and so on.

Could you help me please?