I solved this issue with two modifications.
In first place, I wrote a grub detector based on /usr/lib/os-
probes/mounted/90linux-distro with sequence number 89 to run before
linux distribution detection:
/usr/lib/os-probes/mounted/89grub is attached
Then, I modified /etc/grub.d/30_os-prober to deal with the grub case. I
set the following before the *) default option:
grub)
found_other_os=1
cat << EOF
menuentry "${LONGNAME} (on ${DEVICE})" --class linux --class gnu --class os {
EOF
GDRIVE="`grub-probe -d /dev/sda4 -t drive 2> /dev/null`"
cat <<EOF
insmod ext2
set root='${GDRIVE}'
chainloader +1
}
EOF
;;
*)
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https://bugs.launchpad.net/bugs/446764
Title:
os-prober should chainload other linux if there is bootloader on the
partition
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