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Strange. Plugin "Messaging menu and Unity launcher" is working for me. Which version of plugin do you have ? Mine is 1.3.1.

[calBackendLoader] Using libical backend at /home/wayne/.thunderbird/s4f56rex.default/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/components/libical.manifest

Start in safe mode and disable...

Try to install ubuntu-session package as suggested on http://osdir.com/ml/ubuntu-bugs/2014-04/msg13063.html

sudo apt-get install ubuntu-session

If it is installed try to reinstall it with:
...

Did you try to run thunderbird from terminal ? What is the output ?

You can try to fix broken packages from terminal

1.) Clean cache

sudo apt-get clean

2.) Check for updates

sudo apt-get update

The problem is here


[+0.05s] DEBUG: Launching X Server
[+0.05s] DEBUG: Launching process 946: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.05s] DEBUG: Waiting...

For changing the settings of your nvidia graphics card you can use nvidia-settings utility.

You can try glmark2 package for testing OpenGL perfomance.

On my notebook I have following results...

Do you have a hybrid graphics card ? Wiki for this is on https://wiki.ubuntu.com/X/Config/HybridGraphics .

You can try the following
1.) Remove bumblebee package and delete file...

On my notebook with nvidia hybrid graphics card nvidia-detector returns none but everything works ok (including 3D acceleration).
I have hybrid graphics card with nvidia-331-updates drivers from...

I am not sure but I think that is causing this issue. I would try one of the solutions described in http://askubuntu.com/questions/73804/wrong-login-screen-resolution.

Maybe the one which suggest...

Check for errors in /var/log/lightdm.log. Look into file lightdm configuration file /etc/lightdm/lightdm.conf for any strange configuration entries. If you have any display-setup-script entry try to...

There is error in /var/log/lightdm.log:


[+0.63s] DEBUG: Launching process 1793: /sbin/hybrid-power
[+0.63s] DEBUG: Process 1793 exited with return value 1
[+0.63s] DEBUG: Seat: Exit status of...