Kernel recoveries can be very useful when having a problem with the O.S. They can be easily enabled. You just have to edit /etc/default/grub. At the end of the text, you have to leave it like this:
# Trisquel comes without kernel recovery entries to improve security.
#GRUB_DISABLE_RECOVERY="true"
You have to add the # and "true". Finishing with update-grub2:
$ sudo update-grub2
Revisions
03/09/2016 - 00:09