[cobalt-users] pwdb: internal failure

[Joel <se@xxxxxxxxxx>]

If I try to change a password on my raq3 I receive this error message:
passwd: Critical error - immediate abort

Or if I try to add an user:
adduser: unable to open password file

On var/log/messages I can find this :
Mar 13 15:33:46 mars PAM_pwdb[2267]: user (test/114) update failed; pwdb: 
internal failure - seek help

I can not move the file passwd, save it, modify it or remove it logged in 
as root...
mv: cannot unlink `passwd': Operation not permitted
mv: cannot remove `passwd': Operation not permitted

Any Idea?

Thanks
Joel