up vote 53 down vote favorite
10

When I boot Ubuntu 10.04.3 from a live CD, it asks me to enter a username and password. I have not booted before, and I haven't created an account.

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1  
Then you aren't booting from the ( unmodified ) livecd. – psusi Feb 13 '12 at 19:16
    
Can you specify at what stage you're asked for a username and password? Maybe you can take a photo of your screen? Are you booting from a real CD disk or from a flash drive? If the latter is true - have you or somebody ever used that flash drive before? – Sergey Feb 13 '12 at 21:10
    
I tried to boot from a live-cd ( i get it from mail, long time ago) and from a flash drive (i used it before to install Ubuntu 11.10 successfully )... I'm asked for username and password just after the background appear – Sofiane Bouamine Feb 15 '12 at 9:06
    
it look like the problem is in Gnome because when i try to log in using Ubuntu as username and a blank password in xterm session it work .... – Sofiane Bouamine Feb 15 '12 at 11:20
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@psusi - Yeah, sorry, I wasn't being very clear. I meant that it asks for a password, either though it is blank. I misunderstood your first comment, in that I thought that you meant that it doesn't actually ask for one. Just to clarify, on 14.04 live CD, the username:password is ubuntu:<blank> – Greenonline May 2 '15 at 4:33
up vote 57 down vote accepted

The default username is ubuntu, and the password is blank on an Ubuntu LiveCD.

Brent posted the following over on Serverault:

If the username "ubuntu" with an empty password doesn't work, you may be able to add a new user to the system as follows.

Press Ctrl+Alt+F1 and run this command:

sudo adduser username

Meanwhile in some other Ubuntu-Based Distros (especially official ones), the username goes by their distro name (e.g: Xubuntu='xubuntu', Lubuntu='lubuntu' etc) though you can also find the username of it on some distros by looking at the upper-left hand corner.

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it didn't work ....i'am bigginer in ubuntu... can you explain to me how to add a new user to the system more simply...thnx – Sofiane Bouamine Feb 13 '12 at 19:00
    
Sofiane - as @psusi said, an unmodified Ubuntu livedc should let you log in with the username ubuntu, and a blank password. If that doesn't work, the steps given should be fine - have a look at that linked question for some more options. – Rory Alsop Feb 13 '12 at 19:59
    
thank you Rory Alsop .... when i try to mount the hd partition (sudo mount /dev/sda2 /mnt) i get: (mount: you must specify filesystem type) – Sofiane Bouamine Feb 13 '12 at 20:37
    
@RoryAlsop: The instructions you are referring to will add a new user to the Ubuntu installation on your hard disk (assuming you already have one installed on /dev/hda1). This won't modify LiveCD. I don't see how this may help at all. – Sergey Feb 13 '12 at 21:06
    
But interestingly, the fact that Sofiane has got that far implies a successful login - will amend my post. – Rory Alsop Feb 13 '12 at 21:17
up vote 14 down vote

While it's ubuntu for Ubuntu live images it also depends on the flavor. For Edubuntu it's edubuntu.

Known users and passwords so far (nothing after a colon means a blank password):

  • Ubuntu: ubuntu:
  • Lubuntu: lubuntu:
  • LXLE: qwerty:
  • Ubuntu-studio: ubuntu-studio:
  • Edubuntu: edubuntu:
  • ChaletOS: chaletos-user:
  • Xubuntu: xubuntu:
  • Ubuntu Mate: ubuntu-mate:
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2  
Surprise, surprise - I've just found that it's "lubuntu" for Lubuntu! – lane Jan 26 '16 at 13:38
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LXLE Live CD has user qwerty and no password. Why? Who knows ;) – Piskvor Nov 3 '16 at 13:35
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For those of you looking for a username and password for ubuntu studio distribution and came here just for that I have to mention that the username is "ubuntu-studio" and password is blank. Thats It! . And I have one promise @int_ua could you add my word to your answer? possibly many people come here by the search of keyword "ubuntu studio" but they simply see the results that are exclusive to ubuntu itself. Me and further people will appreciate your work. Thanks. – TechJS Nov 12 '16 at 11:36
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Added, thanks a lot :) Please add new passwords in the future by editing the answer. – int_ua Nov 15 '16 at 15:04
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"ubuntu-mate" for Ubuntu Mate – MV. Dec 18 '17 at 15:11
up vote 2 down vote

Rewriting the same image to USB a second time prevented the login screen from appearing.

I had the same issue on an HP Elitebook Folio 1040 with the standard 16.04.1 image, downloaded and copied to USB with usb-creator-gtk 0.2.23. None of the above mentioned username/password combinations worked for me.

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up vote 1 down vote

I have encountered this issue and here is how I worked around this issue:

If the username is "ubuntu" as it should be and if no password is needed to execute a sudo command, you will still be asked for a password after logging out when logging back in and a blank password usually won't work here.

To get around this, just open a terminal and execute the following command:

sudo passwd ubuntu

follow the prompts and set a password; the current password is blank so if it asks for a password here or for sudo, just press enter.

Now, when the system asks for a password, you will have one and this should work around your problem.

You may need to execute this command from TTY1 or 2.

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up vote 0 down vote

Not blank...example in 14.10 live I installed xfce4 then logged out. Had to add a user. To do so press Ctrl+Alt+F2. You should now see a console. Type sudo adduser anyname and follow the instructions. Afterwards press Ctrl+Alt+F7. You should be at the graphic login able to use the info you created.

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