I've been using an external usb hard drive with three (no LVM) partitions, one of them crypt-luks (set up using palimpsest), for months. It used to get auto-mounted under Gnome when plugged. Seahorse provided the key (Ubuntu 11.04).
Since a few days ago, it does not mount anymore. luksOpen yields a "no key available" error message. No one around me can be suspected to have changed the password. The other (plain ext4) partition mounts normally.
I can backup or dump the header without a problem. Another usb hardrive, with the same luks setup (as shown by header dumps), mounts as usual. All this is reproducible on other systems (another ubuntu 11.04 and a 11.10 beta).
Note that I have the "weird semaphore bug" described here:
http://thread.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/5237/focus=5243, though, in my case:
* it happens approx. once every three luksOpen attempts
* It is not related to luksOpen success or failure (the semaphore error message is just displayed sometimes with any of both hard drives)
* Chromium is not involved
Coincidentally, I have started to use my hard drives with ubuntu 11.00 beta a few days ago. It could have messed up something on one hd and not the other?
Any hint to try and fix this ?
------------- faulty partition
LUKS header information for /dev/sdb3
Version: 1
Cipher name: aes
Cipher mode: cbc-essiv:sha256
Hash spec: sha1
Payload offset: 2056
MK bits: 256
MK digest: 70 41 d4 78 bd 91 9e 82 c3 9c 61 df e8 6b 4e 28 2f 2b 90 94
MK salt: a8 c6 7f 6f 35 2b 48 19 cc e7 27 7a 4f a6 ca a3
9f 78 6d f8 21 b0 48 56 44 27 2c 53 75 bf 0c 86
MK iterations: 22875
UUID: 4b74a5b1-0c46-4808-98c0-3a51ec5f7c8e
Key Slot 0: ENABLED
Iterations: 91811
Salt: 24 f0 44 14 a7 4d ae e6 b6 2b 42 7c 8d 10 87 39
47 05 fd 35 14 46 62 12 f7 5a 7e 99 8a 67 33 f5
Key material offset: 8
AF stripes: 4000
Key Slot 1: DISABLED
Key Slot 2: DISABLED
Key Slot 3: DISABLED
Key Slot 4: DISABLED
Key Slot 5: DISABLED
Key Slot 6: DISABLED
Key Slot 7: DISABLED
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