bionic:
before (1.6.6..) Removing unused kernel packages: linux-headers-generic linux-image-generic after (1.6.8): Removing unused kernel packages: linux-headers-generic
and just to verify, if you install dkms: No packages found that can be upgraded unattended and no pending auto-removals
(the headers won't get removed then)
bionic:
before (1.6.6..) generic linux-image-generic generic
Removing unused kernel packages: linux-headers-
after (1.6.8):
Removing unused kernel packages: linux-headers-
and just to verify, if you install dkms:
No packages found that can be upgraded unattended and no pending auto-removals
(the headers won't get removed then)