Public bug reported:

Ubuntu 9.04 
Ext4 filesystem 

Hi, when I try to mount a .iso image using the command line, (mount -o
loop -t ext4 example.iso /destination) The mount fails and I get the
following error message:

"mount: wrong fs type, bad option, bad superblock on /dev/loop0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so"

The results of dmesg | tail:

"[27349.544574]  sdb: sdb1
[27349.545341] sd 8:0:0:0: [sdb] Attached SCSI removable disk
[27349.545423] sd 8:0:0:0: Attached scsi generic sg2 type 0
[27402.647514] VFS: Can't find ext4 filesystem on dev loop0.
[27425.022697] VFS: Can't find ext4 filesystem on dev loop0.
[27588.533837] VFS: Can't find ext4 filesystem on dev loop0.
[27649.288956] VFS: Can't find ext4 filesystem on dev loop0.
[27718.194976] VFS: Can't find ext4 filesystem on dev loop0.
[27836.388611] FAT: bogus number of FAT structure
[27836.388616] VFS: Can't find a valid FAT filesystem on dev loop0."

This procedure works without a hitch in previous Ubuntu versions,
unfortunately, ext4 seems to be the problem here.

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
Can't find ext4 filesystem on dev loop0
https://bugs.launchpad.net/bugs/369030
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