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figueroa
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PostPosted: Wed Jan 10, 2018 11:02 pm    Post subject: LightDM with duplicate users Reply with quote

I'm using lightdm (Gentoo, of course with XFCE and LXDE) at home and at a school where I support a half dozen servers and desktop PCs. The lightdm configuration is default with GTK greeter. The users in the pull-down user list are always listed twice. It's functional, but doesn't look very well managed. Help appreciated.
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Fitzcarraldo
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PostPosted: Thu Jan 11, 2018 1:17 am    Post subject: Reply with quote

I'm using Gentoo with KDE rather than Xfce or LXDE, but I am using LightDM with the GTK Greeter. What do the LightDM configuration files in /etc/lightdm/ contain? Here are mine for comparison:

Code:
$ grep -v ^# /etc/lightdm/lightdm-gtk-greeter.conf
[greeter]
background=/usr/share/wallpapers/larry-the-cow/gentoo-cow-gdm-remake-1920x1080.png
indicators=~host;~spacer;~clock;~spacer;~language;~power

Code:
$ grep -v ^# /etc/lightdm/lightdm.conf
[LightDM]

session-wrapper=/etc/lightdm/Xsession
[Seat:*]
greeter-session=lightdm-gtk-greeter
session-wrapper=/etc/lightdm/Xsession
display-setup-script=/etc/X11/Sessions/plasma

[XDMCPServer]

[VNCServer]

Code:
$ grep -v ^# /etc/lightdm/users.conf
[UserList]
minimum-uid=1000
hidden-users=nobody nobody4 noaccess
hidden-shells=/bin/false /usr/sbin/nologin

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figueroa
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PostPosted: Thu Jan 11, 2018 3:41 am    Post subject: Reply with quote

Thank you for asking. We have very few differences in configuration.

Code:
$ grep -v ^# /etc/lightdm/lightdm-gtk-greeter.conf
[greeter]
background=/usr/share/lightdm/backgrounds/gentoo-bg_65.jpg
theme-name=Adwaita
icon-name=gnome
cursor-name=gnome
font-name=Cantarell 11
xft-antialias=true
xft-dpi=96
xft-hintstyle=hintslight
xft-rgba=rgb


Which looks very nice.

lightdm.conf is identical even down to the duplicate "session-wrapper=/etc/lightdm/Xsession" though I've tried commenting out the entry under [Seat:*] which seems to have no effect.

users.conf is completely identical.

I remain baffled.
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PostPosted: Thu Jan 11, 2018 9:39 am    Post subject: Reply with quote

My family PC has Lubuntu 17.10 installed, and that uses LightDM 1.24.0 with the GTK greeter (my Gentoo amd64 installation uses LightDM 1.18.3). This may be a red herring, but I notice that /etc/lightdm/users.conf in the Lubuntu installation contains the following:

Code:
#
# User accounts configuration
#
# NOTE: If you have AccountsService installed on your system, then LightDM will
# use this instead and these settings will be ignored
#
# minimum-uid = Minimum UID required to be shown in greeter
# hidden-users = Users that are not shown to the user
# hidden-shells = Shells that indicate a user cannot login
#
[UserList]
minimum-uid=500
hidden-users=nobody nobody4 noaccess
hidden-shells=/bin/false /usr/sbin/nologin

Notice the comment in that file about AccountsService. I wonder if, somehow, LightDM in your case is using the settings in /etc/lightdm/lightdm.conf and AccountsService, resulting in duplicate entries in the greeter's user list? You could try adding the following line in the [SeatDefaults] section in lightdm.conf to see if it gets rid of the duplicate set of users:

Code:
greeter-hide-users=true

Of course that might get rid of all the users in the list, not just the duplicates, but it's worth trying just to see what happens.
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figueroa
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PostPosted: Thu Jan 11, 2018 5:44 pm    Post subject: Reply with quote

Good thinking, but I don't have AccountsService installed. Still, I tried enabling "greeter-hide-users=true" which resulted in no users being offered. At least it shows I'm using the right configuration file.
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PostPosted: Thu Jan 11, 2018 6:41 pm    Post subject: Reply with quote

Hmm... I wonder if what you're seeing has the same root cause as the following problem with SDDM reported five months ago: sddm started displaying username twice
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figueroa
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PostPosted: Thu Jan 11, 2018 10:45 pm    Post subject: Reply with quote

The glibc nsswitch.conf change is quite a finding. I suspect that is it. My systems are running stable, both x86 and x86_64, with glibc-2.25-r9 installed. The matter is way over my head. I'm a mere experienced user, not an operating system engineer.
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Fitzcarraldo
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PostPosted: Fri Jan 12, 2018 2:53 pm    Post subject: Reply with quote

My Gentoo amd64 installation using LightDM with the GTK greeter does not have same problem you're experiencing, but I appear to have the same versions as you:

Code:
$ cat /etc/nsswitch.conf
# /etc/nsswitch.conf:
# $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf,v 1.2 2017/08/12 16:21:44 slyfox Exp $

passwd:      compat files
shadow:      compat files
group:       compat files

hosts:       files dns
networks:    files dns

services:    db files
protocols:   db files
rpc:         db files
ethers:      db files
netmasks:    files
netgroup:    files
bootparams:  files

automount:   files
aliases:     files

Code:
$ eix -I glibc
[I] sys-libs/glibc
     Available versions:  (2.2) [M]~2.18-r1^s [M]2.19-r1^s [M]2.20-r2^s [M]2.21-r2^s [M]2.22-r4^s [M]2.23-r4^s [M]~2.24-r4^s 2.25-r9^s ~2.25-r10^s ~2.26-r3^s ~2.26-r5^s **9999^s
       {audit caps compile-locales debug doc gd hardened headers-only multilib nscd profile +rpc selinux suid systemtap vanilla}
     Installed versions:  2.25-r9(2.2)^s(11:15:55 10/01/18)(multilib rpc -audit -caps -debug -gd -hardened -headers-only -nscd -profile -selinux -suid -systemtap -vanilla)
     Homepage:            https://www.gnu.org/software/libc/
     Description:         GNU libc C library

Code:
$ eix -I lightdm
[I] x11-misc/lightdm
     Available versions:  1.18.3^t 1.18.3^t[1] ~1.24.0-r1^t {audit +gnome +gtk +introspection kde qt4 qt5}
     Installed versions:  1.18.3^t[1](06:30:29 03/12/17)(gtk introspection qt5 -audit -gnome -kde -qt4)
     Homepage:            https://www.freedesktop.org/wiki/Software/LightDM
     Description:         A lightweight display manager

[I] x11-misc/lightdm-gtk-greeter
     Available versions:  2.0.1-r1 ~2.0.2-r1 ~2.0.3 {ayatana branding}
     Installed versions:  2.0.1-r1(06:46:01 03/12/17)(-ayatana -branding)
     Homepage:            https://launchpad.net/lightdm-gtk-greeter
     Description:         LightDM GTK+ Greeter

[1] "local_overlay" /usr/local/portage

Found 2 matches

Do you have any USE flag differences to the ones I am using, as shown above in the eix output?


EDIT: BTW, if you're wondering why I am using LightDM in a local overlay, it's because the upstream code for Version 1.18.3 does not enable the user to suspend or hibernate from the greeter screen. I created a patch to modify the upstream code to enable me to do that: Gentoo Bug Report No. 605370 - >=x11-misc/lightdm-1.18.3: Suspend/Hibernate not available on login screen of non-systemd installations.
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figueroa
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PostPosted: Fri Jan 12, 2018 4:13 pm    Post subject: Reply with quote

Thanks for continuing to explore this.

my nsswitch.conf and eix glibc output is the same as yours.

It might be a notable difference in that I DO NOT have a gtk use flag for lightdm. When I add use + gtk it is ignored. gtk is part of my profile use flags. My profile is "default/linux/x86/17.0/desktop"

Code:
figueroa@jeremiah ~ $ eix -I lightdm
[I] x11-misc/lightdm
     Available versions:  1.18.3^t ~1.24.0-r1^t {audit +gnome +gtk +introspection qt4 qt5}
     Installed versions:  1.18.3^t(12:04:15 12/04/17)(introspection qt5 -audit -gnome -qt4)
     Homepage:            https://www.freedesktop.org/wiki/Software/LightDM
     Description:         A lightweight display manager

[I] x11-misc/lightdm-gtk-greeter
     Available versions:  2.0.1-r1 ~2.0.2-r1 ~2.0.3 {ayatana branding}
     Installed versions:  2.0.1-r1(18:04:58 06/03/17)(branding -ayatana)
     Homepage:            https://launchpad.net/lightdm-gtk-greeter
     Description:         LightDM GTK+ Greeter

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PostPosted: Sat Jan 13, 2018 1:13 pm    Post subject: Reply with quote

I'm assuming you are using OpenRC. If you would like to try my ebuild for LightDM 1.18.3 and the patch in a local overlay on one of the affected machines, you can find the listings and instructions in the following post: https://forums.gentoo.org/viewtopic-p-8015180.html#8015180

I also notice you have USE="branding" for lightdm-gtk-greeter whereas I have USE="-branding", so you could also try changing that.
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figueroa
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PostPosted: Sat Jan 13, 2018 5:05 pm    Post subject: Reply with quote

Yes, I am using OpenRC. Thanks for the ideas. I'll try them one at a time.
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figueroa
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PostPosted: Sat Jan 13, 2018 5:38 pm    Post subject: Reply with quote

The interesting news is that x11-misc/lightdm-gtk-greeter-2.0.1-r1 will not build on either of my local systems with -branding. Possibly because branding is part of my profile default use flags, but the reason for the actual build failure cryptic. It's the first build failure I've experienced on my new month-old x86_64 desktop machine. Bleh!
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PostPosted: Sat Jan 20, 2018 7:44 am    Post subject: Reply with quote

Hi figueroa

I was able to emerge "lightdm-gtk-greeter" with -branding after I did a portage sync. However, it did not solve the issue with the double user entries.

I would be interested in a solution. It is not critical but annoying.
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PostPosted: Sat Jan 20, 2018 8:24 am    Post subject: Reply with quote

I also emerge a more recent version of lightdm, Version 1.24-r1 but still the same. I assume it is a dependency that does not work correctly.
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grant123
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PostPosted: Mon Feb 26, 2018 12:45 pm    Post subject: Reply with quote

Any solution to this? I have the exact same problem.
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PostPosted: Tue Feb 27, 2018 1:45 pm    Post subject: Reply with quote

Where can I look to investigate this?
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PostPosted: Fri Mar 09, 2018 3:36 am    Post subject: newer versions of lightdm seems to solve the probelm Reply with quote

grant123 wrote:
Any solution to this? I have the exact same problem.


I have reported the issue here:

https://bugs.gentoo.org/649980, this ticket includes an ebuild for the updated lightdm.

Go test, and comment on the issue. If you want I also I have an overlay with the updated
ebuild here: https://github.com/oz123/overlay-gentoo
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PostPosted: Wed Mar 14, 2018 11:31 pm    Post subject: Re: newer versions of lightdm seems to solve the probelm Reply with quote

oz_tiram wrote:
Go test, and comment on the issue.

Upgrading to lightdm-1.25.2 didn't fix the duplicated list of users for me, alas.
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PostPosted: Fri Mar 16, 2018 12:48 pm    Post subject: Reply with quote

Same here unfortunately. Not fixed with 1.25.2.
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PostPosted: Fri Mar 30, 2018 8:47 pm    Post subject: Reply with quote

Hello,

I was able to fix it by replacing 'compat files' to just 'files' in /etc/nsswitch.conf for passwd, shadow and group entries
(I'm running lightdm 2.0.1-r1)

The `man nsswitch.conf` says:

Compatibility mode (compat)
The NSS "compat" service is similar to "files" except that it additionally permits special entries in corre‐
sponding files for granting users or members of netgroups access to the system. The following entries are
valid in this mode:
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PostPosted: Sat Mar 31, 2018 6:19 am    Post subject: Reply with quote

`VL wrote:
Hello,

I was able to fix it by replacing 'compat files' to just 'files' in /etc/nsswitch.conf for passwd, shadow and group entries
(I'm running lightdm 2.0.1-r1)

The `man nsswitch.conf` says:

Compatibility mode (compat)
The NSS "compat" service is similar to "files" except that it additionally permits special entries in corre‐
sponding files for granting users or members of netgroups access to the system. The following entries are
valid in this mode:
Solves it for me :D
Thank you!
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