Ubuntu – Ubuntu Login Loop

14.04

I have a problem logging into Ubuntu under all of my usernames. I have tried many solutions. When I look at my .xsession-errors file, I get the following:

xlib: extension "GLX" missing on display ":o"
Script for ibus started at run_im.
Script for auto started at run_im.
Script for default started at run_im.
init: gnome-session (unity) main process (2292) terminated with status 1
init: unity-settings-deamon main process (2284) killed by TERM signal
init: logrotate main process (2192)killed by TERM signal
init: update-notifier-crash (/var/crash/_usr_bin_compiz.1000.crash) main process (2230) killed by TERM signal
init: xsession-init main process (2201) killed by TERM signal
init: hud main process (2288) killed by TERM signal
init: unity=panel service main process (2299) killed by TERM signal
init: Disconnected from notified D-Bus bus
init: window-stack-bridge main process (2215) killed by KILL signal

Best Answer

Short Solution

Try to install linux-headers-generic and reboot to login again:

# apt-get install linux-headers-generic

Longer Story

Same issue here. I've tried serveral ways in askubuntu and stackoverflow but in vain. I write down my solution and hope it will help others.

This issue happens after I use apt-get purge to remove all kernels accidentally, then I install linux-image-generic and hope everything is ok. However, I meet this issue after reboot, .xsession-errors shows almost same message (just pids are different).

After one hour, I found linux-headers-generic is not just header files. It will also recompile necessary components. In my case it's nvidia driver.

After install linux-headers-generic and reboot, everything is back to normal.

Solution 1: Reset the Unity and Compiz

Download Unity Reset tool from here.

Note: It should work with Ubuntu 14.04, 13.10 and 13.04.
Reset Unity using the following command
```
$ unity-reset
```

Solution 2 (Most Recommended): Reinstall Ubuntu Desktop (i.e Unity)

sudo apt-get install --reinstall ubuntu-desktop

Solution 3: Install other Desktop Environment like,Gnome, KDE..etc

Now, I suggest you try Gnome Desktop. It also looks cool.

sudo apt-get install gnome-shell ubuntu-gnome-desktop

After trying any solution, just reboot your system.

$ sudo reboot

Ubuntu – Ubuntu login loop 14.04

Some steps you can take to fix the login loop:

Go to terminal from login screen: Ctl Alt F1

Run updates "sudo apt-get update"

Check all applications "sudo apt-get upgrade"

Check all packages "sudo apt-get -f install"

Update grub "sudo update-grub"

Remove all old applications and packages "sudo apt-get autoremove"

Reboot "sudo reboot"