https://bugzilla.novell.com/show_bug.cgi?id=767272
https://bugzilla.novell.com/show_bug.cgi?id=767272#c7
--- Comment #7 from Agnelo de la Crotche 2012-07-07 05:42:34 UTC ---
OK. just got it here on 12.1 with os-prober 1.53 (but as I aready said, it
affects all versions) after updating the kernel and running updategrub, which
uses os-prober. Ubuntu 11.10 boot entry was missing. I then run os-prober with
the DEBUG flag.
OSPDEBUG=yes os-prober
No volume groups found
mount: unknown filesystem type 'vfat'
/dev/sda13:Fedora release 16 (Verne):Fedora:linux
/dev/sda15:Debian GNU/Linux (squeeze/sid):Debian:linux
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: wrong fs type, bad option, bad superblock on /dev/sda6,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
mount: unknown filesystem type 'vfat'
mount: unknown filesystem type 'vfat'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
/dev/sdc6:Gentoo Base System release 1.12.13:Gentoo:linux
The "unknown filesystem" errors are irrelevant and will go away after I reboot.
os-prober could not mount /dev/sda6 read-only. I try to mount it manually.
mount -v -o ro /dev/sda6 /mnt
mount: you didn't specify a filesystem type for /dev/sda6
I will try type ext4
/dev/sda6 on /mnt type ext4 (ro)
And it works, without complaining I could have specified the file system but
os-prober doesn't either (I might have to double check though).
Now I can either leave /dev/sda6 mounted or unmount it. I doesn't matter.
os-prober will work this time.
OSPDEBUG=yes os-prober
No volume groups found
mount: unknown filesystem type 'vfat'
/dev/sda13:Fedora release 16 (Verne):Fedora:linux
/dev/sda15:Debian GNU/Linux (squeeze/sid):Debian:linux
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
/dev/sda6:Ubuntu 11.10 (11.10):Ubuntu:linux
mount: unknown filesystem type 'vfat'
mount: unknown filesystem type 'vfat'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
mount: unknown filesystem type 'ufs'
/dev/sdc6:Gentoo Base System release 1.12.13:Gentoo:linux
As you can see, Ubuntu (/dev/sda6) was found this time. So why did it fail the
first time? It the fs would have been unstable, manual (ro) mounting wouldn't
have worked either.
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