Yesterday (November 4), I update my Ubuntu 14.04. After that I can't login. It something like a loop. I type the password, enter and it's return to login-screen.  The same happen if try the guest mode.  After some research, I found that the problems isn't with the login itself. But with the video card driver.  Any clue?
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My Ubuntu is stuck in a login loop when trying to enter my desktop. When I login, the screen gets black and soon after that the login screen comes back.   I've read that the problem might be caused by an error depending on the graphics, here's my graphics card: ATI Radeon 7670M
43750
When I install Ubuntu, it never shows an option to set a password, yet there is a password when trying to log in to the admin account and when I try to install packages. I can't change the password in Root because when I try to it says "Authentication manipulation token error". When I try to fix the shadow password thing in root it says access denied.
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I've been using Ubuntu(12.10) for a long time, and recently, my Ubuntu went through yet another update.  The whole update prompt showed up, following by a password prompt, and finally the good ol' progress bar...  Everything went well, and later on, I shut down my computer.  The next day, I turned my PC on, went to the login screen. I went ahead, and logged in, but after that, all I could see was a black screen, and my cursor!  I checked the forums, and got various tips, none of which worked...  Now I'm stuck with an Ubuntu installation that's completely useless.  One more thing:  I even tried logging in through Guest, but same problem! :\  My Computer Specs: Motherboard: Intel DG41WV Processor: Intel Core 2 Quad Q6600 @ 2.40GHz Graphics: Intel G41 Express Chipset RAM: Dual Channel, DDR3 2*2GB (4096 MBytes) HDD: Seagate 500GB SATA   ---- DETAILED INFO ----  To be a little more precise about my problem, after I log in, I can see a black screen and my cursor. Plus, importantly, I was able to see a login screen, hence I'm sure Ubuntu is rendering properly, and also pretty sure that there's no problem with the drivers (Otherwise I shouldn't even get a login screen, right?).  Anywho, another (probably) important thing is that, after logging in, I can hit Ctrl+Alt+1 and get up a recovery console.  The only thing that doesn't load is my actual GUI desktop  Then, I ran unity from the recovery console, it went through a few commands, got stuck at OpenGL for a few seconds, then zoomed throught many more lines of code, and ended up with this:  ERROR 2012-01-03 20.51.23 unity.launcher.Icon TrashLauncherIcon.cpp:62 Could not create file monitor for trash url: Operation not supported  *** glibc detected *** compiz: malloc(): memory corruption: 0x09c861d6 ***   After that. back at Ctrl+Alt+F7: Desktop Background + Cursor  So back to the terminal again, I had to hit Ctrl+C to get back again.  now, I typed unity again, and this was the output:  WARNING: no DISPLAY variable set, setting it to :D compiz (core) - Info: Loading plugin: core compiz (core) - Info: Starting plugin: core unity-panel-service: no process found   so now I did a sudo service lightdm restart :  X10: fatal IO error 4 (Interrupted system call) on X server ":0" after 131 requests (130 known processed) with 0 events remaining. lightdm stop/waiting lightdm start/running, process 2852   Im back at the login screen, and I login again, now Im back to black screen (Yes, I lost the Desktop Background as well)  So, once again, I try unity (same response as last time):  WARNING: no DISPLAY variable set, setting it to :D compiz (core) - Info: Loading plugin: core compiz (core) - Info: Starting plugin: core unity-panel-service: no process found   And still a black screen! :\
15885
Since upgrading to 13.10, I can't log in to unity desktop. Light dm works correctly, but attempting to log in tries to start the session then drops back to light. I've already dropped to terminal (ctrl+alt+f2) and done this:  sudo apt-get update  sudo apt-get install --reinstall ubuntu-desktop  sudo apt-get install unity   Logging in as a guest session also fails. Logging in to other window managers works with varying degrees of success.  Note: I have Cinnamon 2.0 installed from PPA.  I'm using a 2 monitor setup.  Also of note is that the session prior to my upgrade to 13.10 the background of unity failed to display at all, instead showing what was there in the screen buffer from the previous frame. The entire OS worked correctly otherwise though, so I just ignored it for the session. No other upgrades or even updates were done prior to this occurring.  My upgrade path to 13.10 was basically this: Install 13.04 alongside Windows 7, use ubuntu as a glorified web browser for a while, get updates (in preparation for 13.10), install 13.10.  I also used Unity Tweak Tool to change some aspects of unity, particularly auto-hide.  Any help or ideas would be appreciated, as I'm typing this on my phone :(
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Is there any way to make the login screen from a locked session (either by using Ctrl+Alt+L or from a screen timeout) look like the login screen when you're starting a new session? I hate that everything on the lock screen aside from the password input is black.
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Yesterday I was trying update my OS from 12.04 to 14.04.  This was done in my VirtualBox. I left the terminal open and continuing downloading during the night.  This morning when I came to my office, I saw the screen of my VirtualBox Ubuntu was deadlocked, I can't do any operation to it, it stays at some chromium interface I viewed last night.   So I forced restart it, and then I found I was enter into the interface of 14.04 . After I logged in, several error box popped out. But after I installed VirtualBox GuestAddtion package. No more error box popped out when I enter the GUI at the recently log-ins.  But I was still worried about if there may be some lethal bugs left when updating, at least it wasn't ended at an normal way.  So, is there a way that I can check if my update was complete?
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I just bought a new laptop with ubuntu installed on it. When i first turned on the laptop ubuntu started with an error and restarted. Then when it turned on again i only had the guest session option. I've tried, but i can't use sudo in the terminal: Sudo: unable to change to root gid: operation not permitted Sudo: unable to initialize policy plugin I tried the recovery path too, but i don't have a username and can't do anything. I can only go in guest session. Please help, sorry if this is something obvious to do, it's my first time opening ubuntu.
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I am using ubuntu 15.04 now. For a while I used Gnome as my desktop, but now I changed it back to Ubuntu. After the change, the desktop is fine, but the login GUI isn't back; it's still in Gnome now.  For Gnome login GUI I mean the black GUI with a gray box in the middle and there's a gear icon(settings of the desktop, and the options are: metacity, Gnome, System default, and Ubuntu) and some text(I cant remember that).  And the Ubuntu login GUI should be like several users appear on the left and the selected one with the text box for you to enter the password.  It is so confusing because when I lock the computer using  Win  +  L , or  Ctrl  +  Alt  +  L , the GUI is ubuntu's.  Please tell me how to fix this. Thanks.
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After upgrading from 12.04 to 14.04 I could log in to my X session (albeit with really low graphics). While trying to fix the graphics, I managed to break the X session.  Now, after typing my password in the unity-greeter, the items disappear and I can only see the desktop background and the pointer. This happens for every user. I can still log in in tty's. How can I solve this?  Also, I cannot seem to be able to install nvidia-current as it tries to install nvidia-304 and it depends on old video-abi libraries. Is there a way to tell the package manager that nvidia-current should use a newer version?
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After upgrading from 14.04 to 14.10 my computer cannot boot anymore, it is stuck at the logo screen (with animated dots).  By displaying the boot process, I see that it is stuck at "Stopping log initial device creation". When I press Ctrl+Alt+F2, only a flickering dash appears, and I can't even log in.    Thank you in advance for any suggestions.
110467
I have a small issue with my Ubuntu (I think After an upgarde). When I try to login (Login Screen), I get disconnected and get back to the screen (again &amp; again).  I tried:   Trying to login with others Desktop environements. Booting from old kernel. log in via command line [apt-get update &amp;&amp; apt-get upgrade]. removing ~/.gconf directory. sudo apt-get install --reinstall ubuntu-desktop and sudo apt-get install unity   None of these solutions worked.
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My Ubuntu 14.04 is stuck when trying to login my desktop. The screen goes black and soon after that the login screen comes back.   I followed all steps in  but the issue was not solved.
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I upgrade my Ubuntu to 11.10. I restarted and it worked perfectly until now when I restarted again and it is now in text mode after I login. Can somebody please provided some suggestions on what I should do? I do not understand what happened.    I tried restarting lightdm but it is already running.
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If I enter my password correct first time, I login as normal.  If I enter my password wrong, it says invalid password. If I attempt to enter the correct password now then the screen freezes and doesn't go to dock as normal. I must restart using a physical button or shutdown to get out. Login works normally after restart, assuming I get it right first time.  EDIT:  After entering a wrong password, if I click cancel and then go back to my user to login, it works fine.
50229
I have tried to update my Ubuntu version and after updating, my boot screen  is displaying a kernel panic message and I'm unable to access my login screen.
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I have latest version of Ubuntu 16.04 and I installed latest version of Cuda Toolkit 8.0. After install Cuda Toolkit, I am stucked on login screen and I can't login into Ubuntu with my password. Is there posibility to get into system? Or do you have any manual, how to corectly install Cuda toolkit? I need Cuda toolkit on Ubuntu. (Sorry for my English)   There is my procedure, how I installed Cuda (officialy from Nvidia)  sudo dpkg -i cuda-repo-ubuntu1604-8-0-local_8.0.44-1_amd64.deb sudo apt-get update sudo apt-get install cuda
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I disabled all services and startup applications and now the computer won't let me log in. It will get me to the initial startup screen, but it won't connect to the Internet. Then when I click or press a key to log in, the password box never appears.   How to go back to normal boot? Shift+Restart or F8 to get into safe mode doesn't work. Restoring to a system restore point resulted in an error. Even Resetting Windows didn't work.