Try To Login Terminal with Correct Password : Authentication Error Occurs

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We appreciate the difficulties you are facing, but it would make more sense to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs#When%20not%20to%20file%20a%20bug.

This is because when using "su" to get a root shell, you're being asked for the root password. The root account is locked by default on Ubuntu, and therefore does not have a password.

What is your end goal? Do you want a root login? Then use sudo:

$ sudo su -
[sudo] password for <username>:

Careful though. You can do dangerous things very easily if you do it as root (and Linux is not forgiving). Suggest that you one-off each item with sudo, instead of becoming root.

I was trying to install the java environment, I had trouble installing.
Someone did not write the commands right on the internet. I wish
there was a easier way designed just for beginners like the .deb files.
Like for example, download a .deb file then go to the gdebi extractor
and then click on "install packages". I wish there was a gdebi that
would install these difficult tar.gz and .bin files. It takes a
rocket scientist to install these files properly. I just don't
know how to do it right.

Adam E.

On Fri, 2009-09-11 at 02:52 +0000, Kevin Hunter wrote:
> Your question #82451 on gnome-terminal in ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/gnome-terminal/+question/82451
>
> Kevin Hunter proposed the following answer:
> What is your end goal? Do you want a root login? Then use sudo:
>
> $ sudo su -
> [sudo] password for <username>:
>
> Careful though. You can do dangerous things very easily if you do it as
> root (and Linux is not forgiving). Suggest that you one-off each item
> with sudo, instead of becoming root.
>

In fact, there is an easier way: use the package manager. Unless you really know what you're doing, I'd suggest using synaptic rather than the command line.

System→Administration→Synaptic Package Manager

In the quick search at the top, type 'java' (without quotes), and wait a few seconds for the list to update. You'll be presented with a bunch of packages relating to Java.

A couple of the packages are the core Java for which you're looking:

sun-java6-jre
openjdk-6-jre

It's your choice which one you choose. Right-click and one and mark it for installation. Then click the Apply button (up-top) and let it do it's thing.

Do you now have Java installed, gccradioscience?