The only thing that worked for me when this happened about a year ago was to make sure everything was uninstalled
Code:
sudo apt-get remove --purge libreoffice*.*
And
Code:
sudo add-apt-repository ppa:libreoffice/ppa
Code:
sudo apt-get update
I think (I am Guessing) what might be going on with your setup is libreoffice-gtk not being fully removed.
Code:
sudo apt remove libreoffice-gtk
And Now
Code:
sudo apt dist-upgrade && sudo apt install libreoffice-gtk2 libreoffice-gnome
You should now have a shiny new versions of LibreOffice Writer, Calc, Impress, et al.
Fingers Crossed
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