[bitfolk] Help needed repairing VPS damage

HI All, I was attempting to free up some space, (/boot is over full) and I fear I have damaged my Ubuntu 18/04 installation. When I run sudo apt-get update && sudo apt-get upgrade the following errors are flagged up in the middle on the results. WARNING: missing /lib/modules/4.15.0-101-generic Ensure all necessary drivers are built into the linux image! depmod: ERROR: could not open directory /lib/modules/4.15.0-101-generic: No such file or directory depmod: FATAL: could not search modules: No such file or directory depmod: WARNING: could not open /var/tmp/mkinitramfs_vr26f3/lib/modules/4.15.0-101-generic/modules.order: No such file or directory depmod: WARNING: could not open /var/tmp/mkinitramfs_vr26f3/lib/modules/4.15.0-101-generic/modules.builtin: No such file or directory The system does boot, and appears to serve its web sites properly. If it helps uname -r gives 4.15.0-88-generic There are no ubuntu updates to apply. How can I recover? I feel right out of my depth! Thanks Ian -- Ian Hobson Tel (+351) 910 418 473 -- This email has been checked for viruses by AVG. https://www.avg.com