A few weeks ago, i had my Ubuntu 17.10 with kernel version 4.13.0-37. I accidentally deleted a few important packages like
network-manager, and i could not connect to internet at all when i booted. So i decided to install Ubuntu 16.04 with kernel version 4.4.0-21-generic from DVD keeping my
$HOME intact. It worked. I can boot when i select the 4.4.0-21-generic option from my GRUB2 menu.
When i try to boot from the kernel 4.13.0-37, it goes into emergency mode, and i tried this solution here. I still booted in emergency mode,
e2fsck said that root filesystem is clean.
My question is how can i eliminate the newer versions of the kernel, will i ever be able to upgrade from 4.4.0-21-generic.
Edit 1: I did an update&&upgrade today, and the kernel updated to 4.4.0-116, and i could boot from this kernel image, what i do not understand is, this image was already existing on my filesystem, but it booted only after it upgraded from 4.4.0-21-generic.