I get the same problem.  Working with Jaunty amd64, my home directory
mounts fine when it is all done automatically, but when I try to do it
by hand (as root from the latest Jaunty LiveCD as part of a system
diagnostic run), I get the results described in #4 above: Filenames
decrypted properly, but "No such file or directory."

Note that mount.ecryptfs reports that it is doing the following:
"""
Attempting to mount with the following options:
  ecryptfs_unlink_sigs
  ecryptfs_fnek_sig=a521ad46fa60c9c7
  ecryptfs_key_bytes=16
  ecryptfs_cipher=aes
  ecryptfs_sig=a521ad46fa60c9c7
"""

I.e. it is using the *SAME* signature for both fnek and file contents.
That should explain the symptoms.

The problem seems to be with the user utils.  No matter what combination
of command line options (mount -o ...) or interactive input I use, the
fnek signature always gets used for both ecryptfs_fnek_sig and
ecryptfs_sig.

Since I can mount my home directory automatically with no problems, it
would seem that there a way of decrypting the files without going
through the user tools.  Is that the case?  Can a workaround be built
from that?

-- 
"mounting eCryptfs: [-2] No such file or directory" when trying to mount 
encrypted home
https://bugs.launchpad.net/bugs/455709
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