Ubuntu 12.04 unstable: after sign in/w password system locks-up displays background picture

Seems related to Unity and compiz:

A) if you have autologin not active please choose Unity-2d at login (click on the gear wheel near the user name at login)

B) if you have the user automatic login set (you can't change session preference without login first) so please turn off the automatic login for your user, how to do using terminal:

1) switch to a pseudo terminal by pressing press ctrl+alt+f1 whn the pc is strarted and you have the clear background and made login with your user and password

2) edit the file /etc/lightdm/lightdm.conf to do it type:

sudo nano /etc/lightdm/lightdm.conf

change the row:

autologin-user=yourusername

to

autologin-user=

save and exit then reboot by pressing ctrl +alt + canc or type

sudo reboot

at lightdm login please choose a different session mode foe example unity-2d

On 03/24/2012 09:25 AM, marcobra (Marco Braida) wrote:
> Your question #191559 on compiz in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/compiz/+question/191559
>
> marcobra (Marco Braida) proposed the following answer:
> Seems related to Unity and compiz:
>
> A) if you have autologin not active please choose Unity-2d at login (click on the gear wheel near the user name at login)
>
> B) if you have the user automatic login set (you can't change session
> preference without login first) so please turn off the automatic login
> for your user, how to do using terminal:
>
> 1) switch to a pseudo terminal by pressing press ctrl+alt+f1 whn the pc
> is strarted and you have the clear background and made login with your
> user and password
>
> 2) edit the file /etc/lightdm/lightdm.conf to do it type:
>
> sudo nano /etc/lightdm/lightdm.conf
>
> change the row:
>
> autologin-user=yourusername
>
> to
>
> autologin-user=
>
> save and exit then reboot by pressing ctrl +alt + canc or type
>
> sudo reboot
>
> at lightdm login please choose a different session mode foe example
> unity-2d
>
Did what you said with the following results:
1. got the command line as instructed
2. found the file /etc/lightdm/lightdm.conf
3. the file only had 3 lines:
         [SeatDefaults]
          greeter=session=unity-greeter
          user-session=ubuntu
4. checked the file in 11.10 and it is the same without a line that says
'autologin-user=yourusername' or any autologin line
5. did not change anything in the file i.e. exited
6. rebooted and at the sign in screen clicked on the gear and changed to
ubuntu - 2d
7. system signed in to a unbuntu desk top and works as normal (at least
lets me into the system and e-mail)
8. re booted and changed back to unbuntu and system will not work - just
the background picture as before but the ctrl+alt+f1 will give a command
line

Thanks, I can at least get in using the -2d at the sign in screen under
the gear wheel. If there is a fix I can do let me know.

Ruben Ackerman

Suggest you to report a bug for making Ubuntu more better !

thanks

then try:

user-session=ubuntu-2d

Please mark this question as solved since you are not more in trouble with this ...

Thanks actionparsnip, that solved my question.