[Bug 192593] Re: unable to change user password

[Adam Sommer]

I wouldn't think that the passwd utility would be able to change a
password in Active Directory.  As far as I can tell passwd can only
change shadow passwords, but I could be wrong about that.  In order to
change a password from the shell after joining an AD domain I would
think another utility such as ldappasswd or smbpasswd would be needed.

Can you try smbpasswd?

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unable to change user password
https://bugs.launchpad.net/bugs/192593
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