When doing an
apt-get upgrade I sometimes get a message saying "The following packages have been kept back". For example:
$ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: linux-headers-server linux-image-server linux-server 0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
What does this mean exactly? Obviously the packages have been held back and not installed, but why?
The follow-on question would be: how does one upgrade these kept back packages?