Hallo,
your log essentially show s it failing due to a bad configuration:
  Unable to locate guest account [smbguest]!
  get_guest_info3 failed with NT_STATUS_NO_SUCH_USER
  ERROR: failed to setup guest info.

I assume you have enabled something like this in your /etc/smb.conf
   guest account = GibtEsNicht

Essentially juts a user that doesn't exist.
This is not in the default config.

That is a broken config, you'd either have to remove that section and
overall clean up your smb.conf or you have to make sure it works by
creating the user as needed.

If you have no custom samba conf that you have to retain you can most easily 
get back to a default config with:
$ apt remover --purge samba samba-common
$ apt install samba

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https://bugs.launchpad.net/bugs/1787375

Title:
  package samba 2:4.7.6+dfsg~ubuntu-0ubuntu2 failed to install/upgrade:
  Unterprozess installed samba package post-installation script gab den
  Fehler-Ausgangsstatus 1 zurück

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