Ubuntu :: SU Command Not Working - Authentication Failure
Apr 2, 2011
Here is what happens. I type in "su", without the quotes, to switch to root. I enter my password.
Code: jon-Tuxbox:~$ su
Password:
su: Authentication failure
jon-Tuxbox:~$ It fails, and I get kicked back to the command line. I recently fixed the permissions on the shadows file and the su file in the bin directory, and that is what caused this. Before it would give another error. I tried resetting the password for root, but it didn't fix it.
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Apr 5, 2011
I have just installed the latest version of ubuntu in my desktop (core i5 with 2gb ram, gnome desktop) when i try to log in root usin "su -" command....authentication failure occurs. what should i do ?....i distinctly remember root password and it is working otherwise like while logging in, opening install/remove software application etc.
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Oct 8, 2010
I had installed xp & ubuntu on my laptop hp compaq cq-40. Then i got this problem on su password authentication failure. I had alreadyformat and re installed ubuntu. But the su authentication still failure,
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May 3, 2011
I am running Ubuntu 11.04 which I like very much (except for Unity - so I am using Ubuntu Classic).
Whenever I try to use "su - " I get Password Authentication Failure. I have checked Caps Lock (obviously) and have also tried resetting the password using "passwd" - but with no success.
If I use "sudo ...." with a command the password is accepted.
I have the same software installed on two computers but the problem only occurs on one - the other is OK!
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May 29, 2011
su doesn't work in terminal. i found one (click), and tried it, but it didn't fix it. Everything else works. Sudo, Software manager, synaptic package manager... I know i'm putting the right password in. Heres a picture, ignore everything except the last 4 lines.
Everything before it was me trying a proposed fix in the thread mentioned above.
Quote:
sudo dpkg --configure -a
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade
I've tried changing my password as well. I got the same error. Also, "sudo su" works fine. I'm not sure if theres a difference as i'm new to ubuntu....linux in general. Can you explain the difference between sudo and su, and sudo su? Also, can you explain what any commands you need me to do are? that way, i'm not just leaching.i'm trying to do is install Java!
Sysinfo:
Quote:
Release: Ubuntu 11.04 (natty)
GNOME: 2.32.1
Kernal: 2.6.38-8-generic
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May 22, 2010
Im using FEDORA 12 (constantine )....Everything was working fine.....until yesterday when i tried login to my GUI(gdm) it says authentication failure. so i tried logging in from CLI and it didnt worked either...(it didnt say "password incorrect",rather it it simply reset the screen to "login name:",thats weird...right?)
Then i tried to login as root from from CLI (by default Fedora does not support root login to GUI?) and i was able to login.....
Then it said "System powering down in one minute"............. i didnt understand why that happened.....! but it didnt power down in one minute...
I tried changing my user passwd...still no change.....
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Feb 25, 2010
I managed to get Ubuntu installed, however, it just won't let me log in. I perform the net-install, and tell it my user name and password. However, once the install has completed, and the system rebooted, I cannot log in to Ubuntu (on X-screen or TTY). I've tried it twice - once with Karmic Koala Ubuntu installed with GNOME - the other with just CLI and they both fail.
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May 8, 2010
I upgraded from 8.04LTS to 10.04LTS desktop. I can do sudo as root at the terminal, but I can't pass authentication trying to add a user (System->Administration->Users and Groups).
Here is what I got: An error occurred while checking for authorizations: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. You may report this as a bug.
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May 19, 2010
In Empathy, Facebook worked just fine but upon a recent restart of Empathy, I started to get an authentication error and I can no longer get Facebook chat to work.My password has not changed.
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Jul 1, 2010
cannot update fully because of apt authentication failure. what is this? what can I do to resolve it?
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Jun 13, 2011
I cant access my box after upgrading from fedora 13 to 15 i wasn't near the computer during the process and i don't know if it asked for user and password ,but its upgrade and it need to have my old setting so why i'm not able to log in at all , even not as root.
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Jun 16, 2010
i have been running Ubuntu for about 3 days now, finally getting all my files moved back to the drive and what have you.I came from running windows, and an Android phone with full su access, and done up all custom-like..I am loving the speed, etc. great experience so far. BUT: the headphone port on my laptop is broken, and so I run [ran] and external soundcard, a Creative X-fi 5.1 USB SC. I have found linux drivers for this unit, and am trying to install. I have googled the crap out of how to do this, yet am getting stuck.
Here is where I'm getting stuck. I have extracted the package, entered into the sub folder, and am trying to run the Make install:
...laptop:/tmp/xfi-0.0.0.0$ cd ./xfi
...laptop:/tmp/xfi-0.0.0.0/xfi$ su -c "make install"
Password:
su: Authentication failure
...laptop:/tmp/xfi-0.0.0.0/xfi$
what in heck do i type at password... have I NOT done something, am I doing something wrong.... it does not accept my normal password, so I am lost.
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May 1, 2011
Yesterday I installed a program called localepurge to remove the locales I don't need, I've chosen only en and ar to maintain and removed the rest, after restarting, can't access the ubuntu, I wrote the password manytimes and checked the upper and lowercase. I'm using Ubuntu 11.04 on a Toshiba L500 laptop
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Feb 19, 2010
I have installed Ubuntu 8.04 inside windows and every time I go to the terminal and type "su" it asks me for a password. Well the password I set before the install doesn't work, it gives me an authentication failure. I thought that since it was inside windows it didn't set me as a root user. I go to user groups and I see my name there and then "root" above it, but its grayed out. Is there a default root password I can enter?
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Aug 8, 2011
I was hoping that someone could point me in the right direction. I just did an install and the os is up and running. During install, I set a root password and also set up a regular user account. The only option at login is the regular user acct. Needless to say, the os asks me to provide the root pw for just about everything I need to do.get an authentication failure. (I assume that this is the same as permission). I can find plenty of info on how to restrict access but nothing relevant to my problem. Just to rule out an install problem, I installed the os a 2nd time. I am very sure I have my passwords correct. One other thing to note is that on the 1st install, I used a different pw for root and regular user. On the 2nd, just to keep is as simple as possibl I used the same pw for root and reg user account. I am new to debian, but the distro that I have been using (slackware)
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Apr 16, 2011
OS=FC14 x86_64
DM=Gnome
I've installed pure-ftp, and the firewall is open on port 21, the router has port forwarding.
I can connect to this machine, from my smart-phone and a laptop using its IP Address 77.xx.xx.xxx
I'm getting user OK but its not accepting my password or one I just made on another account
This is whats happening:-
What layer of extra security is stopping this working, as the guy attempting access is trying to send a file to big to attach to an e-mail.
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May 2, 2010
have been experiencing an error (the past few weeks) whenever I try to install a software package using the default installer. Each time I enter the root password it is not accepted and I am unable to get past it and the installation fails.This is the error message that is issued:[PK_TMP_DIR|dir:///var/tmp/TmpDir.mf2zCf] Repository already exists.I am able to enter the root password in a terminal session without any problem along with using the Install Software option in the main menu.
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Sep 3, 2009
I was messing around with changing the dictionary for our PAM cracklib module and seemed to have stuffed something up.When I attempt to log in through a telnet session with any user that has a password I getAuthentication FailureThis session is no longer connectedI am still able to log in via the Web admin using the root user/password.I can also log in from a telnet session if the user has no password.
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Jun 3, 2011
I Configured LDAP Server on ubuntu Server 10.04 ,(using url ldap) and Client also it's working fine. After that I changed to ssl encryption and create certificate in server side. Now it's not authenticating from server it's shows Incorrect Password, but I can login though terminal if I am root user ,then it not ask any password it's logon to ldap user. After I changed to ldap server to ssl encryption and made one changes in client side uri ldaps://ip-address/ (/etc/ldap.conf).
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Jan 11, 2011
I have a strange behaviour on a Slackware 13.1 box:
Code:
user@host$ su
su: Authentication failure
[code]...
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Jun 19, 2011
Am unable to send mail from Outlook to my Postfix SMTP server.
Am getting the following in the /var/log/maillog.
Code:
Think I've pretty much followed the instructions correctly here.
[url]
Also, I looked for the PID of the smtpd and did a strace on it.
Code:
Code:
However, when I looked at the permission of this file, it should be accessible by everyone.
Code:
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Jul 17, 2010
New install of 13.1. Installed Pidgin 2.7.1, compiled for SSL per instructions here: [url] but still no love. Any attempt to connect to MSN returns "Unable to authenticate: Authentication Failure."
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May 9, 2010
I just installed Fedora 12 on HP Pavilion (dual boot with Windows vista). I made it all the way through the installation and created my user account. A few seconds later I got the login screen asking for my password. I enter the password and get "Authentication Failure."
The name that shows up on the login screen is my full name, not the user name that I created. Is that wrong?
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Dec 16, 2010
I have installed fedora 14 in my computer. I installed some applications from root. I created a user id. I am unable to install my internet (broadband connection) now. every time it shows the error "Authentication failure" "install from root" something like that. How can I switch between user and root. Or how can I login as root again?
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Jan 20, 2010
I just got Fedora 12, and I used su root to change the bin ownership to my primary developer account. For some reason, though, all subsequent attempts to log in as root have had authentication failure, be it through su or through the startup login screen. This does NOT occur for adminstrator tools such as Groups and Users.
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Jun 4, 2011
I just started learning the Linux system and I installed Ubuntu 11.04 as a partition on my IMac. I want to change my authorization in the terminal to su - , but I keep being told authentication failure.
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Jun 13, 2010
I was having a problem with the keyring asking me for a password after I changed my user password. I googled it and found that since the password changed, I will get asked for the keyring password until I delete ~/.gnome2/keyrings/login.keyring. What happened was that I wasn't paying attention that you had to generate a new keyring password before rebooting.
Now, whenever I try to login via gdm, I get this message: error initiating conversation with authentication system - general failure
How do I get it working again? I can still login from the terminal.
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Jul 29, 2011
I am trying to login as root but i end up with an error that says: su: Authentication failure
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Apr 28, 2011
I am new to to dovecot and would like some help, so please be kind.I have one user that can send mail but not read it either by pop3 or imap.I am running Dovecot 2.0.11 on Fedora 14.
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Apr 8, 2010
My system software is installed on an encrypted LVM on hda1 and hda2. My home directory takes up the whole of hdb1 which is also encrypted. I can boot up into the kde desktop okay, but when I open up konsole and type 'su' and my root password I get the message "su: Authentication failure". I am absolutely certain that I am using the right password.
Even more strangely, if I fire up synaptic and give it that same password I am able to install software. Does anyone have any suggestions as to what's gone wrong and how I can fix it?
I can also type Ctrl-Alt-F2 and log in as root to do administrative tasks without any problems so I cannot understand why konsole has locked me out.
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