If you are running the BETA, perform a system snapshot, use the Update Manager to apply available updates, run the following commands and reboot:
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apt remove ttf-mscorefonts-installer
apt install libreoffice-sdbc-hsqldb sessioninstaller ttf-mscorefonts-installer
sudo rm -f /etc/systemd/logind.conf
apt install --reinstall -o Dpkg::Options::="--force-confmiss" systemd
sudo rm -f /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla