Comment 7 for bug 1843222

I did add an entry with two /boot/grub/grub.cfg files and one did include my 40_custom file. That file did include "This" but in the first comment line as shown below:

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry 'Xubuntu 18.04' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-93b2f0baee676e9a' {

I scanned /boot/grub/grub.cfg on "This" and it only occurs in comment lines. The grub.cfg.new completely misses those text-includes from 40_custom, as I would expect. But it did include booting from Linux 5.2.

I had the same problem, when upgrading the last of my three Ubuntus, that one also booted from Linux 5.0. The first upgrade went OK without problems. Maybe it started to go wrong after I upgraded one of the two datapools. That datapool could not be mounted or imported anymore. The second and third upgrade went wrong, any relation?