When I burned Ubuntu to a disc and tried it without installing it prompts me for a username and password when I didn't make one for Ubuntu. Do I keep them blank or do I use my Windows username and password?
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4In no case you will have to use your Windows credentials! Could you post a screenshot or copy the exact words to your question? ([edit](http://askubuntu.com/posts/603112/edit) it instead of posting a comment or answer! You can upload the screenshot without registration to http://imgur.com/ and copy the link to your question while you still have too few reputation to post it directly) – Byte Commander Mar 30 '15 at 13:07
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When ever i use my windows credentials its says invalid username and password plus im using the newest version of ubuntu – Gryyxn Mar 30 '15 at 13:58
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1Read my comment above! – Byte Commander Mar 30 '15 at 14:00
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@Gryyxn Try using `ubuntu` & `ubuntu` for the username and password respectively. – RPiAwesomeness Mar 30 '15 at 15:52
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@RPI Awesomeness i tried that and it said invalid username/password – Gryyxn Mar 30 '15 at 17:47
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Change the password in recovery shell and set up the auto-login for lightdm greeter (aka login screen)
1) When you boot, go to "Advanced options for Ubuntu" and select recovery mode.

2) Once you see the menu below, select root shell, execute the following command mount -o rw,remount /. Next, change your password with passwd username, where username is your actual username. You will be prompted to enter new password.

3) Next execute the command nano /etc/lightdm/lightdm.conf to edit the configuration file for the login screen (lightdm greeter). You will need two lines, [Seat Defaults] and autologin-user=username where username is your actual username. Refer to the image below.

4) All done! Reboot
Greenonline
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Sergiy Kolodyazhnyy
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Also, refer to [How to recover lost administrative password](http://askubuntu.com/a/24024/295286) – Sergiy Kolodyazhnyy Mar 30 '15 at 20:26