I just did the latest up date , when I turned on my Acer laptop this morning it started spazzing , it's asking for my login which I have no idea about but I know my password just not login , it says it after it first starts with lots of writing Can anybody help me out please ?
2 Answers
Your login password is the same as your user password.
At the screen with a lot of writing where your boot has stopped, open a text-only virtual console by using the keyboard shortcut Ctrl+Alt+F3.
At the
login:
prompt type your username and press Enter.At the
Password:
prompt type your user password and press Enter.After you have logged in in the console type:
sudo service lightdm start # Ubuntu 14.10 and earlier
or
sudo systemctl start graphical.target # Ubuntu 15.04 and later
and press Enter to bring up your default login screen and then login to your Ubuntu desktop environment as usual. If have a different desktop environment than the default Ubuntu Unity desktop environment, please comment so that I can change the command in Step 4.
After you have logged in to Ubuntu as usual, please check Where can I look up my update history? which tells you how to check your recent update history. Please provide information about what were the packages in your latest update, so that I can tell you how to undo the latest update.

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Enter you username in the login box.
If you do not know your username boot using a live CD (or if you are dual booting with Windows then use ext2fsd).
Open file browser and mount Ubuntu drive.
Go to home.
There must be a folder. The name of the folder is your username.
Reboot and login to Ubuntu.
Now open terminal, type in `sudo dpkg-reconfigure lights
Use arrow keys and select lightdm and press enter.
Note If you use Gnome replace lightdm with gdm3.

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Good suggestion on recovering a forgotten username. ;-) – Elder Geek Jul 31 '16 at 16:30
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Nice method to use! – George Udosen Nov 24 '17 at 07:14