22 not upgraded (packages have been kept back)

~$ LC_ALL=C sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  gir1.2-lokdocview-0.1 liblibreofficekitgtk libreoffice libreoffice-avmedia-backend-gstreamer libreoffice-base libreoffice-base-core
  libreoffice-base-drivers libreoffice-calc libreoffice-core libreoffice-draw libreoffice-evolution libreoffice-gnome
  libreoffice-gtk3 libreoffice-impress libreoffice-math libreoffice-ogltrans libreoffice-report-builder-bin libreoffice-sdbc-firebird
  libreoffice-sdbc-hsqldb libreoffice-sdbc-postgresql libreoffice-writer python3-uno
0 upgraded, 0 newly installed, 0 to remove and 22 not upgraded.