Ack! I'm getting bitten by this bug too:
$ sudo mount -t ext4 /dev/sdb /home/conrad/Desktop/temp
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
$ dmesg | tail
[ 9496.925863] sd 13:0:0:0: [sdb] 625142448 512-byte logical blocks: (320
GB/298 GiB)
[ 9496.927439] sd 13:0:0:0: [sdb] Test WP failed, assume Write Enabled
[ 9496.927449] sd 13:0:0:0: [sdb] Assuming drive cache: write through
[ 9496.936921] sd 13:0:0:0: [sdb] Test WP failed, assume Write Enabled
[ 9496.936934] sd 13:0:0:0: [sdb] Assuming drive cache: write through
[ 9496.936950] sdb: sdb1
[ 9496.955599] sd 13:0:0:0: [sdb] Test WP failed, assume Write Enabled
[ 9496.955617] sd 13:0:0:0: [sdb] Assuming drive cache: write through
[ 9496.955632] sd 13:0:0:0: [sdb] Attached SCSI disk
[ 9977.758268] EXT4-fs (sdb): VFS: Can't find ext4 filesystem
running Karmic 64-bit; drive is attached via USB. I had backed up all my
files to that drive in Jaunty before I installed Karmic :)
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Ext4 external HDD can't be mounted with Karmic, but with Jaunty
https://bugs.launchpad.net/bugs/479640
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