apt-get update The following packages have been kept back

 apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  bind9-host dnsutils libbind9-50 libdns50 libisc50 libisccc50 libisccfg50 liblwres50 linux-generic linux-generic-pae linux-image-generic
0 upgraded, 0 newly installed, 0 to remove and 12 not upgraded.

The message has been kept back most often means that the upgrade was kept back due to dependencies that are not met.

Some possible solutions

  • A simple way is to invoke dselect to help out with the update. dselect performs the actions necessary to realize that state (for instance, the removal of old and the installation of new packages).
     apt-get dselect-upgrade
  • While apt-get and aptitude are basically the same, aptitude is sometimes better at handling dependencies than apt-get
     aptitude upgrade
  • Another solution is to install the package using apt-get install to install the upgraded package and let apt-get install the missing dependencies
     apt-get install dnsutils