[Comm-en] Recover missing boot option in GRUB after upgrade

[TheGrove]

Today I upgraded my p9 install to p10 via the command line (apt-repo set
p10 && apt-get update && apt-get dist-upgrade).  Everything performed
well and the upgrade completed successfully.  However, when I rebooted,
GRUB only displayed my p10 install (on /dev/sda1) but I lost my install
of Sisyphus (on /dev/sda5), which I recently installed to test the
'oldinst' option using image regular-lxqt-latest-x86_64.iso.

Although my main objective was to upgrade to p10, I would still like to
experiment with Sisyphus from time to time.  Is there an easy way for me
to recover the option in GRUB to boot into Sisyphus on /dev/sda5?

David.

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