0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded

apt-get update
apt-get upgrade

Info:
The following packages have been kept back:
linux-image-amd64
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

apt-get install aptitude
Info:
aptitude is already the newest version.

aptitude safe-upgrade
restart

apt autoremove