When you have the problems after updating Ubuntu from 16 to 18 and try to update the Linux kernel and getting the following messages?
update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.15.0-62-generic
W: initramfs-tools configuration sets RESUME=UUID=18e2a087-bb29-4ac0-9b80-4ca749b63730
W: but no matching swap device is available.
You can change and use the new creates swap partition on your Linx server.
First follow the instructions :
How To Add Swap Space on Ubuntu 18.04
Then you can do the following:
vi /etc/initramfs-tools/conf.d/resume
Comment the old partition with #
And add the following text to this file.
RESUME=/swapfile
Now test the new configuration.
update-initramfs -u -k all
update-initramfs: Generating /boot/initrd.img-4.15.0-62-generic
update-initramfs: Generating /boot/initrd.img-4.15.0-60-generic
If no errors are showing reboot the server and test if it works fine again?