Follow-up Comment #1, bug #64385 (project grub):
We see the problem lies in /etc/grub.d/10_linux
if [ -x /lib/recovery-mode/recovery-menu ]; then
GRUB_CMDLINE_LINUX_RECOVERY=recovery
else
GRUB_CMDLINE_LINUX_RECOVERY=single
GRUB_CMDLINE_LINUX_RECOVERY gets born here, with no way for the user to get
his hands on it before hand, except by damaging the file.
It should instead first appear as
GRUB_CMDLINE_LINUX_RECOVERY="$GRUB_CMDLINE_LINUX_RECOVERY bla bla bla"
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