I do not know what is this "advanced" thing. I do not remember having that
(and do not want to reboot just to see).
It is common to have an entry where the kernel is booted with the keyword
'single'. It directly brings a root terminal. It is called the "recovery
mode" because it aims to repair a broken system. It is useful when all
administrative forgot their passwords too. You should obviously not boot such
an entry unless you need to.
Anyway, Trisquel does not have such an entry by default even if, in my
opinion, having it helps the recovery from problems and does not weaken the
security (no remote access is possible when the bootloader interface is
available and there is no security when a physical access is available). That
is why, on my systems, I edit /etc/default/grub to comment the following
line:
GRUB_DISABLE_RECOVERY="true"
