I strongly believe that the root cause is in the linux-boot-prober as it
returns a strange result when launched (from my Xubuntu Precise) against
a Xubuntu Quantal partition:
(verbatim copy)
$ sudo linux-boot-prober /dev/sda7 2> /dev/null
/dev/sda7:/dev/sda7:Ubuntu' --class ubuntu --class gnu-linux --class gnu
--class os $menuentry_id_option
'gnulinux-simple-7205122a-da09-4f1f-97ef-67d3f70df317:/boot/vmlinuz-3.5.0-15-generic:/boot/initrd.img-3.5.0-15-generic:root=UUID=7205122a-da09-4f1f-97ef-67d3f70df317
ro quiet splash $vt_handoff
/dev/sda7:/dev/sda7:Ubuntu, with Linux 3.5.0-15-generic' --class ubuntu --class
gnu-linux --class gnu --class os $menuentry_id_option
'gnulinux-3.5.0-15-generic-advanced-7205122a-da09-4f1f-97ef-67d3f70df317:/boot/vmlinuz-3.5.0-15-generic:/boot/initrd.img-3.5.0-15-generic:root=UUID=7205122a-da09-4f1f-97ef-67d3f70df317
ro quiet splash $vt_handoff
(/verbatim copy)
More, this strange result also likely causes the following code in
30_os-prober to misbehave (returning two entries with strange names)
LINUXPROBED="`linux-boot-prober ${DEVICE} 2> /dev/null | tr ' ' '^' |
paste -s -d ' '`"
prepare_boot_cache=
for LINUX in ${LINUXPROBED} ; do
(etc)
done
I hope this helps
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https://bugs.launchpad.net/bugs/1017678
Title:
Duplicate entries in grub2 menu for second ubuntu installed on another
partition
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