[ubuntu-in] ubuntu9.04 authentication failed -to go to root.

[Sriranga(77yrsold)]

Ninad,
thanks for the valuable guidance. Since I am newbie to linux i did not
experiment but followed as per your guidance. extract of terminal reproduced
below:

sriranga at ubuntu:~$ cd tesseract-ocr-read-only-408/
sriranga at ubuntu:~/tesseract-ocr-read-only-408$ sudo password
[sudo] password for sriranga:
sudo: password: command not found
sriranga at ubuntu:~/tesseract-ocr-read-only-408$ sudo passwd
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
sriranga at ubuntu:~/tesseract-ocr-read-only-408$ sudo ldconfig
sriranga at ubuntu:~/tesseract-ocr-read-only-408$ sudo
usage: sudo -h | -K | -k | -L | -l | -V | -v
usage: sudo [-bEHPS] [-p prompt] [-u username|#uid] [VAR=value]
            {-i | -s | <command>}
usage: sudo -e [-S] [-p prompt] [-u username|#uid] file ...
sriranga at ubuntu:~/tesseract-ocr-read-only-408$ sudo ldconfig
sriranga at ubuntu:~/tesseract-ocr-read-only-408$ su
Password:
root at ubuntu:/home/sriranga/tesseract-ocr-read-only-408# ldconfig
root at ubuntu:/home/sriranga/tesseract-ocr-read-only-408#

Nothing displayed for ldconfig. where I made a mistake?
-sriranga(77yrsold)

On Wed, Jun 30, 2010 at 6:46 AM, Ninad Pundalik <ninadsp16289 at gmail.com>wrote:

> Hi,
> > > ocr-read-only-408$ su
> > > Password:
> > > su: Authentication failure
> @Sriranga: 'su' is the command that logs you into the root shell and
> hence, the password required would be that of the root user.  If you
> have not set a password for the root, then it is a randomly generated
> password (AFAIK) at install by Ubuntu.  If you wish to set the root
> password, you must do that first with 'sudo passwd', first give your
> account's password (so that sudo is authenticated) and then enter the
> new password for root twice.  I'd recommend the command I've given in
> the next line, if an interactive root login is a must.
>
> > Instead of su, use "sudo bash" to become root on a shell console. When
> > prompted for password, give your own password and you should be root.
> @Nishant:  The recommended way to get to a root shell without using
> 'su' is to use 'sudo -i' (read the sudo manpage for further details
> about this option).  It ensures that environment variables like
> SUDO_USER and other SUDO_* variables are correctly setup in the shell.
>
> NOTE: Unless you know what you are doing, logging into root
> interactively (with either su or sudo -i) is not recommended by
> Ubuntu.  Using sudo for each command ensures that an audit trail
> remains, should something go wrong.  There are people who debate the
> advantages of sudo, and you may google it up, to read both sides of
> the story, as I am not experienced enough to take any side and support
> it.
>
> Ninad S. Pundalik
> Twitter: @ni_nad | Identica : @ninad | http://ninadpundalik.co.cc/blog
> GPG Key Fingerprint: 2DF7 B856 C75E C9F9 0504 C0EF D456 1946 7C45 2C6
>
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