Thanks a lot for your response.
Yesterday after i wrote the email, i decided to reinstall Ubuntu AGAIN.
I have installed the latest NVIDIA driver from avenard repositories and
now everything seems to be ok, no problem yet.
I thing (is just a guess) that the first time, the problem with
GdkPixbuf was because of nvidia drivers - that i was able to fix it
eventually.
But the last problem with "gdm[2885]: pam_nologin(gdm:auth): cannot
determine username" was driving me crazy. I hope it will never
apear again.
Best regards
Cosmin
Brian Cameron wrote:
Cosmin:
It seems that you are getting a lot of errors from GdkPixbuf
complaining
that images are not valid. If I were to guess, I think the problem
might be that the gdmgreeter theme you are using is broken in some way.
If you can start X via startx, you can try running gdmsetup as root and
try changing the theme to a different one and see if that helps. Or
you could try changing the setup from using the "Themed Greeter"
(aka gdmgreeter) to using the "Plain Greeter" (aka gdmlogin). Does
that work better?
If you can not run gdmsetup, you can also modify the GDM configuration
files by hand. Different distros install the GDM configuration files
to different places. The defaults should be in
/usr/share/gdm/defaults.conf and user-custom settings get saved in
/etc/X11/gdm/custom.conf or /etc/X11/gdm/gdm.conf. Though, as I said
the paths might be a bit different on your distro.
You can find out where the files are by running:
For the defaults.conf file:
$ gdmflexiserver --command="GET_CONFIG_FILE"
For the custom.conf file:
gdmflexiserver --command="GET_CUSTOM_CONFIG_FILE"
You can read more about how to modify the GDM configuration in the GDM
docs in the "Configuration" section:
http://library.gnome.org/admin/gdm/
Note if you modify the GDM configuration files by hand, you should
run "gdm-restart" as root to restart GDM so it loads the new
configuration. This restart is not needed if you change the
configuration via gdmsetup.
If that does not help, then you could also try turning on debug in the
GDM configuration file, recreate the problem, and then share with us
any gdm-related output that gets sent to your syslog (/var/log/messages
or /var/adm/messages, depending on your system).
Brian
I serach on different forums, but i could'n
find a solution until now.
What i did was a purge o all nvidia driver, and do a fresh reinstall.
After that, i noticed 2 things happening:
1. If i enter: #startx, the X server starts without asking me for
user/pass but it sais somthing about a strange user (see attach).
2. If i enter: #sudo /etc/init.d/gdm start - then the same problem whit
flashing login screen apear.
Since i'n no linux guru, have no ideea what's with this behavior.
I'm stil waiting for someone who can help me get back my login screen.
Cosmin Neagu wrote:
Hello everybody,
This is my first email here, so don't judge me or my problem to harsh.
For about 2 weeks i'm having some problems with my laptop and the login
screen. How the problem apeared:
I was using Ubuntu 8.10, when someday, when I restarted the laptop the
login screen was flushing continuously and i wasn't able to login
because no login screen apeared. Only with CTRL+ALT+F1 i could get into
the sistem. Since anyway i was planning to upgrade to 9.04, i didn't
bother to see what was happend.
Then i run 9.04 for a few days when the same problem occured. That was
very ugly, i belived it was because of some bugs in Ubuntu
distributions or caused by my hardware since it happend on two diferent
version.
I heard of Linux Mint, so i have installed it, and after a while the
same problem, login screen does not load, keeps flushing and playing
the welcome sound in backgroud continuously - now am writing from an
ugly windows XP.
Since it apear that it is doing something in the backgroud like it was
tring to show the login screen i get into console and i looked at some
logs.
tail -f /var/log/syslog
May 15 13:00:45 Dell gdmgreeter[8399]: GdkPixbuf-CRITICAL:
gdk_pixbuf_get_width: assertion `GDK_IS_PIXBUF (pixbuf)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GdkPixbuf-CRITICAL:
gdk_pixbuf_get_height: assertion `GDK_IS_PIXBUF (pixbuf)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GLib-GObject-CRITICAL:
g_object_unref: assertion `G_IS_OBJECT (object)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GdkPixbuf-CRITICAL:
gdk_pixbuf_get_width: assertion `GDK_IS_PIXBUF (pixbuf)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GdkPixbuf-CRITICAL:
gdk_pixbuf_get_height: assertion `GDK_IS_PIXBUF (pixbuf)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GLib-GObject-CRITICAL:
g_object_unref: assertion `G_IS_OBJECT (object)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GLib-GObject-WARNING: invalid
(NULL) pointer instance
May 15 13:00:45 Dell gdmgreeter[8399]: GLib-GObject-CRITICAL:
g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)'
failed
May 15 13:00:45 Dell gdmgreeter[8399]: GdkPixbuf-CRITICAL:
gdk_pixbuf_get_width: assertion `GDK_IS_PIXBUF (pixbuf)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GdkPixbuf-CRITICAL:
gdk_pixbuf_get_height: assertion `GDK_IS_PIXBUF (pixbuf)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GLib-GObject-CRITICAL:
g_object_unref: assertion `G_IS_OBJECT (object)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GdkPixbuf-CRITICAL:
gdk_pixbuf_get_width: assertion `GDK_IS_PIXBUF (pixbuf)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GdkPixbuf-CRITICAL:
gdk_pixbuf_get_height: assertion `GDK_IS_PIXBUF (pixbuf)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GLib-GObject-CRITICAL:
g_object_unref: assertion `G_IS_OBJECT (object)' failed
May 15 13:00:45 Dell gdmgreeter[8399]: GLib-GObject-WARNING: invalid
(NULL) pointer instance
Spend a few hours on google, and the problem seemed to be with my
graphin nvidia card. Finally i have installed the drivers version
180.51 and everything was ok.
#glxinfo reported everything right.
But today (with Ubuntu 9.04, nvidia 180.51 and all updates done) the
same problem reapeared.
OK, the logs say like this while the login screen keeps flashing:
- From syslog:
May 19 09:45:45 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:45:47 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:45:50 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:45:52 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:45:56 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:45:59 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:46:00 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:46:03 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:46:05 Dell gdm[2885]: WARNING: Couldn't authenticate user
May 19 09:46:07 Dell gdm[2885]: WARNING: Couldn't authenticate user
- From auth.log:
May 19 09:46:01 Dell gdm[2885]: pam_nologin(gdm:auth): cannot determine
username
May 19 09:46:02 Dell gdm[2885]: pam_nologin(gdm:auth): cannot determine
username
May 19 09:46:03 Dell gdm[2885]: pam_nologin(gdm:auth): cannot determine
username
May 19 09:46:04 Dell gdm[2885]: pam_nologin(gdm:auth): cannot determine
username
May 19 09:46:05 Dell gdm[2885]: pam_nologin(gdm:auth): cannot determine
username
May 19 09:46:06 Dell gdm[2885]: pam_nologin(gdm:auth): cannot determine
username
May 19 09:46:07 Dell gdm[2885]: pam_nologin(gdm:auth): cannot determine
username
The config files:
/etc/pam.d/gdm
#%PAM-1.0
auth requisite pam_nologin.so
auth required pam_env.so readenv=1
auth required pam_env.so readenv=1
envfile=/etc/default/locale
@include common-auth
auth optional pam_gnome_keyring.so
@include common-account
session required pam_limits.so
@include common-session
session optional pam_gnome_keyring.so auto_start
@include common-password
/etc/pam.d/gdm-autologin
#%PAM-1.0
auth requisite pam_nologin.so
auth required pam_env.so readenv=1
auth required pam_env.so readenv=1
envfile=/etc/default/locale
auth required pam_permit.so
@include common-account
session required pam_limits.so
@include common-session
@include common-password
One more thing. Now, if i try glxinfo it says: Error: unable to open
display.
So, can anyoane please help me with this problem? i realy like linux
for what it can do on the server side, but i cannot work without
graphic interface.
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