if you terminate the command: apt-get upgrade I get this message:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
chromium-browser libgl1-mesa-dri owncloud-files pix-icons pix-plym-splash
pixel-wallpaper pprompt raspberrypi-ui-mods rpi-chromium-mods sonic-pi
0 upgraded, 0 newly installed, 0 to remove and 12 not upgraded.
how do I force the updates of these files?