password restrictions are different in the GUI and on the command line.

s.achterop at s.achterop at
Sun Jul 17 15:47:24 UTC 2016

On 07/17/2016 05:27 PM, Ralf Mardorf wrote:
> On Sun, 17 Jul 2016 17:14:09 +0200, Ralf Mardorf wrote:

>> How did you notice that lightdm doesn't work with a simple
>> password, chosen by command line? Did you get a message? Is there an
>> entry in the log file saying this?
>> You did not enter your simple password, while by accident caps lock was
>> active or something like this?
> PS: For some users I have no need for a password at all, so those user's
> passwords are not nearly that strong, as the above mentioned passwords.
> Sometimes it makes sense to set up a dummy user for testing purpose.
> Consider to do the same and chose a really weak and short password and
> if lightdm doesn't allow to log in, post the message, log file or what
> ever else you get, saying that your password isn't strong enough.


sorry I wasn't more clear.
The password of the main user set in the installation is something like:  abc1234
The password of another user set by adduser is something like: 12_abcdefgh
These passwords work with a console or ssh login.

With these passwords lightdm gives an error about "incorrect password ... "
The lightdm logfile says:
     [+731.48s] DEBUG: Authenticate result for user thisuser: Authentication failure

So for me lightdm doesn't work with simple passwords.
By the way, it started working when I made the passwords longer.

   Regards, Sietse

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 3619 bytes
Desc: S/MIME Cryptographic Signature
URL: <>

More information about the ubuntu-users mailing list