Caught in loop when trying to login after upgrade from 14.10 to 15.04

Question

After an otherwise uneventful upgrade from 14.10 to 15.04 I cannot login. When I provide my password the screen flickers briefly and I am back at the login screen.

I have checked permissions on .Xauthority and they are set correctly.

I have also tried creating a new user, but the same problem persists.

Before reverting to the login screen I momentarily see an alert box "System program problem detected." I do not know if this is relevant to the issue.

My /var/log/lightdm/x-0.log contains this as the last line:

error setting MTRR (base = 0....) Invalid argument (22)

Thanks, but that doesn't change anything, the problem persists. — mac, Apr 23 '15 at 18:47
I'm glad you understood that. OK, try installing gdm. It might work better. — TheWanderer, Apr 23 '15 at 19:10
Tried that in the mean time. That is even worse, with gdm I don't even get to a login screen, just black and some flicker every few seconds. — mac, Apr 23 '15 at 19:14
Also try sudo dpkg-reconfigure xserver-xorg, sudo dpkg-reconfigure lightdm, sudo dpkg --configure lightdm and sudo dpkg --configure xserver-xorg. — TheWanderer, Apr 23 '15 at 19:17
I do not think this is a duplicate. I have tried the accepted answer and it does not resolve the issue. — mac, Apr 23 '15 at 19:31
Tried the dpkg commands, no difference. Both dpkg --configure report that the packages are installed and configured. — mac, Apr 23 '15 at 19:50

score 9 · Answer 1 · answered Apr 24 '15 at 01:36

9

I fixed this problem by removing the nvidia drivers

sudo apt-get remove --purge nvidia-*
sudo apt-get install ubuntu-desktop

answered Apr 24 '15 at 01:36

Max Dolgih

91

1

Tried that one too, with no luck. – mac Apr 24 '15 at 05:09
1

+1 from me, works. Reboot to ensure that the entire system knows the nvidia drivers are gone though. – dascandy May 02 '15 at 13:01

score -1 · Answer 2 · edited Apr 13 '17 at 12:23

-1

You can try this first, here is a link. Ubuntu gets stuck in a login loop

If worse comes to worse you can remake the live USB. I would recommend Unetbootin as it really easily helps you to make it. The links for Unetbootin is here http://unetbootin.sourceforge.net/. And the one for Ubuntu is here .http://www.ubuntu.com/download/desktop.

When you go back with the new USB, you can reinstall cleanly for sure that way.

Hope this helps. Good Luck!

edited Apr 13 '17 at 12:23

Community

1

answered Apr 23 '15 at 19:14

Apad121

443
2
7
19

I recommend against Unetbootin. I used it to create a USB key for a Debian installation and the installation failed in weird ways although I tried several times in different ways. Not using Unetbootin immediately fixed the problem. – domsson Oct 25 '15 at 14:48
@domdom ---- You reccomend against Unetbootin because you tried it to create a USB key for a Debians installation and failed in weird ways. However, we are talking about Ubuntu here...I have used plenty of different programs for creating live USBs for Ubuntu and the on that I found both most efficient and easy to use... Unetbootin. I personally enjoy it as all the user is required to do is select the version of Linux they want from a drop-down menu and the rest is just left to time. This makes it very easy for users as they can leave their pc and return back later with it all finished :) – Apad121 Oct 26 '15 at 16:13

Caught in loop when trying to login after upgrade from 14.10 to 15.04

2 Answers2

Linked