[Bug 1038093] Re: Fedora17 does not appear in 12.04's GRUB menu

[YannUbuntu]

@all: according to another ubuntu-fr member (http://forum.ubuntu-fr.org/viewtopic.php?pid=10586931#p10586931):
- the bug is not present with 12.04 liveCD, it is a regression which appeared from 12.04 updates (I don't know if before or after 12.04.1)
- the bug concerns Fedora17 and OpenSuse 12.1

@JBS: please
(1) boot on a 12.04 (not 12.04.1) liveCD , choose "Try Ubuntu", open a terminal, type "sudo os-prober", and indicate if Arch appears.
(2) Then mount Arch partition, retype "sudo os-prober" and tell if Arch appears. 
(3) Then redo (1) and (2)  with a 12.04.1 liveCD and tell the results please.

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https://bugs.launchpad.net/bugs/1038093

Title:
  Fedora17 does not appear in 12.04's GRUB menu

Status in “os-prober” package in Ubuntu:
  Confirmed
Status in “os-prober” package in Debian:
  New

Bug description:
  The os-prober of Ubuntu does not detect Fedora when Fedora's partition
  is unmounted (which is frequent). Consequence: Fedora does not appear
  in Ubuntu's GRUB menu.

  WORKAROUND: mount the Fedora partition before doing update-grub in
  Ubuntu.

  Bug confirmed by several French users with Fedora17 and Ubuntu12.04
  (http://forum.ubuntu-fr.org/viewtopic.php?pid=9695571#p9695571 and
  http://forums.fedora-fr.org/viewtopic.php?id=57393 ).

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