On 05/15/18 22:18, Frédéric wrote:
>> See https://bugzilla.redhat.com/show_bug.cgi?id=1515100.
>>
>> I didn't have a problem when I upgraded a while back.  I don't have F27 
>> system that
>> had been updated from F26.  But FWIW the current /etc/pam.d/sddm-greeter 
>> file contains.
>>
>> # Setup session
>> session         required pam_unix.so
>> -session                optional pam_systemd.so
>> -session                optional pam_elogind.so
> so the difference with mine is just those dash at the start of the
> last 2 lines. Is this the same as commenting the lines?

According to the pam.d man page

       If the type value from the list above is prepended with a - character the
       PAM library will not log to the system log if it is not possible to load
       the module because it is missing in the system. This can be useful
       especially for modules which are not always installed on the system and
       are not required for correct authentication and authorization of the
       login session.

So, it isn't the same as commenting the line. 


-- 
Conjecture is just a conclusion based on incomplete information. It isn't a 
fact.

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