Doing an upgrade on an Ubuntu 18.04 boxen: -
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
linux-headers-4.15.0-112 linux-headers-4.15.0-112-generic linux-image-4.15.0-112-generic linux-modules-4.15.0-112-generic linux-modules-extra-4.15.0-112-generic
Use 'apt autoremove' to remove them.
The following packages have been kept back:
base-files libgl1-mesa-dri linux-generic linux-headers-generic linux-image-generic netplan.io ubuntu-server
0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.