Looking for logging into the Ubuntu 14.04 Unable To After Upgrade site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Ubuntu 14.04 Unable To After Upgrade site. After that you can login as usual with your login credentials.
https://askubuntu.com/questions/454576/cant-login-to-ubuntu-14-04-after-upgrade
https://ubuntuforums.org/showthread.php?t=2240524
https://www.researchgate.net/post/How_to_overcome_Linux_Login_problem_in_my_Ubuntu_1404_OS
https://itsfoss.com/failed-to-start-session-ubuntu-14-04/
https://itsfoss.com/fix-unable-login-ubuntu/
https://bugs.launchpad.net/bugs/1311511
https://forum.parallels.com/threads/unable-to-login-to-ubuntu-16-04.345023/
https://seravo.fi/2015/fixing-black-screen-after-login-in-ubuntu-14-04
https://wrjih.wordpress.com/2016/04/28/ubuntu-14-04-cannot-login-after-upgrade/
http://www.beginninglinux.com/home/troubleshoot/ubuntu-does-not-start-gui-or-login-loop
https://unix.stackexchange.com/questions/170650/ubuntu-does-no-let-me-log-in-to-my-user-how-can-i-fix-it
https://www.linuxquestions.org/questions/linux-software-2/after-upgrade-i-cannot-login-my-ubuntu-15-10-a-4175574956/
https://www.dell.com/support/article/de/de/debsdt1/sln304459/precision-5510-with-ubuntu-1404-installed-unable-to-login-after-the-nvidia-driver-updates