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Old 01-11-2005, 12:05 PM   #1
scs_24
LQ Newbie
 
Registered: Nov 2004
Location: Stuttgart, Germany
Distribution: Debian
Posts: 1

Rep: Reputation: 0
su root: authentication failure (password correct)


When I run su or su root to get root privileges I get the following error message (regardless if I run su in a terminal window or directly on console):

sharon@obelix:~$ su
Password:
su: Authentication failure
Sorry.

sharon@obelix:~$ su root
Password:
su: Authentication failure
Sorry.

My root password works correctly on console. Su works correctly if I substitute to a different user from root. My Linux Distribution is Debian.

I think this might be a group problem so I also printed the group membership of the user I was when I tried to run su.


sharon@obelix:~$ groups
sharon dialout cdrom floppy sudo audio dip video users
sharon@obelix:~$

I appreciate your help.

ScS
 
Old 01-11-2005, 03:12 PM   #2
bigjohn
Senior Member
 
Registered: Jun 2002
Location: UK .
Distribution: *buntu (usually Kubuntu)
Posts: 2,682
Blog Entries: 9

Rep: Reputation: 45
Presuming things work the same, you probably have to have "wheel" group, as that's usually the one that controls the "su" command option(s).

Quote:
bash-2.05b$ groups
wheel audio games users
bash-2.05b$
regards

John

p.s. you could always see if you can get into root with suspaceminus i.e. su -
 
Old 05-26-2009, 05:54 AM   #3
Orion_X11
LQ Newbie
 
Registered: May 2009
Posts: 1

Rep: Reputation: 0
su root: authentication failure (password correct)

Quote:
Originally Posted by scs_24 View Post
When I run su or su root to get root privileges I get the following error message (regardless if I run su in a terminal window or directly on console):

sharon@obelix:~$ su
Password:
su: Authentication failure
Sorry.

sharon@obelix:~$ su root
Password:
su: Authentication failure
Sorry.

My root password works correctly on console. Su works correctly if I substitute to a different user from root. My Linux Distribution is Debian.

I think this might be a group problem so I also printed the group membership of the user I was when I tried to run su.


sharon@obelix:~$ groups
sharon dialout cdrom floppy sudo audio dip video users
sharon@obelix:~$

I appreciate your help.

ScS
______________________________________________________

Hi, after searching google and asking in IRC Freenode > #debian and having the same problem as you I thought that if I removed my username and my home directory after making a backup I could have a solution for "su" authentication failure. So, I created a directory called "Safe" in /home deleted my username and username directory and went to "System > administration > Users and Groups" and added me again there and recreated my home user. After that I issued "su" command again typed the passw and "voialą" it was a total success. Moved my files from Safe to my /home/me and had no more problem with "su". Perhaps, you can try this way :-)
 
Old 12-12-2009, 02:07 AM   #4
itzAB
LQ Newbie
 
Registered: Sep 2009
Posts: 1

Rep: Reputation: 0
late reply

I just came to this thread when i too faced the same problem
Now i think it's solved
i think following will help you

su passwd
 
  


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