Comment 7 for bug 1826757

Thank You, yes libreoffice* was the reason for my mystery extension install...

But now I cannot remove libreoffice cleanly any longer:

   sudo apt autoremove --purge libreoffice*

    Errors were encountered while processing:
     libreoffice-lightproof-en
     libreoffice-lightproof-hu
     libreoffice-lightproof-ru-ru
    E: Sub-process /usr/bin/dpkg returned an error code (1)

And I cannot remove the extensions on their own:

sudo apt remove libreoffice-lightproof-en libreoffice-lightproof-ru-ru libreoffice-lightproof-hu

       find: ‘/usr/lib/libreoffice/share/extensions/lightproof_ru_RU/pythonpath’: No such file or directory
       dpkg: error processing package libreoffice-lightproof-ru-ru (--remove):

Renewed install claims they are already there:

      sudo apt remove libreoffice-lightproof-en libreoffice-lightproof-ru-ru libreoffice-lightproof-hu
      ...
      libreoffice-lightproof-ru-ru is already the newest version (0.3.4+1.6-1).

lightproof-hu does not show in the extension manager, but I have two others, solver.. and wiki publisher, but cannot break the lock to uninstall them.

And root gives me trouble as well

    sudo libreoffice
    (soffice:30900): IBUS-WARNING **: 17:34:05.008: The owner of /home/myname/.config/ibus/bus is not root!

I had cleaned the cache with sudo apt-get clean.