I am totally new to Ubuntu which came pre-installed in my laptop. I upgraded to 14.04 version but I think it was not installed properly when I restarted the system. Now it is not letting me login even though I am entering the right password. I read somewhere to enter into root but I can't as I don't get any screen on pressing Alt+CRTL+F1 or F3.

  • Please provide some details regarding the hardware (in particular the graphics module) and the way you upgraded to Ubuntu 14.04. – Bruni Oct 2 '15 at 14:02
  • Its a Dell 15 3452. I upgraded by going into system settings but i know it didnot complete properly. – Neelam Ahlawat Oct 2 '15 at 14:11
  • 2
    Possible duplicate of Ubuntu gets stuck in a login loop – karel Mar 4 '17 at 21:46

I had a similar issue and resolved it by doing this:

It's not just F3 but it is Ctrl+Alt+F3 and login into the shell. Also, I've seen laptops that have the behavior of the FN and F buttons reversed, meaning that you have to press the FN button to actually press the F key. I have no idea why but the N5010 is such a model.

Assuming we get that far, run

ls -lah

If in the output the line is along these lines:

-rw-------  1 root root   53 Nov 29 10:19 .Xauthority

then you need to do

chown username:username .Xauthority 

and try logging in.

Else, do

ls -ld /tmp

Check for the first 10 letters in the left: they should read exactly so: drwxrwxrwt.

drwxrwxrwt 15 root root 4096 Nov 30 04:17 /tmp

Else, you need to do

sudo chmod a+wt /tmp 

and check again.

If not both, I'd recommend you either

dpkg-reconfigure lightdm

or uninstall, reinstall it. Now press Alt+-> until you reach the login screen again, and restart.

Please note that this was not my solution. I found the answer at this site in a post such as this one:

Ubuntu stuck on login screen

I'm unable to find the exact post that I initially found but this one is similar/close enough and I'd saved the information just to be able to it again if I needed it.

  • @NeelamAhlawat - I just want to check to see if you managed to resolve this. If you haven't then, by all means, let us know and someone may have another route to try. – KGIII Oct 4 '15 at 15:33
  • Comments are not for extended discussion; this conversation has been moved to chat. – Seth Oct 6 '15 at 15:43
  • This problem is so pervasive but so far there is no definitely answer... – NathaneilCapital Dec 21 '15 at 8:35

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