Questions tagged [authentication]

Questions about authenticating wireless connections, SSH keys, or passwords in Ubuntu.

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Installed google remote desktop now I need password for everything

I installed google remote desktop extension in firefox. I couldn't really get it to work, when I logged on it was only black. I didn't tinker with it because I saw that every time I did anything at my ...
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49 views

I can no longer SSH into a machine that I have a wired connection to. How can I get back in?

I am developing software on a custom board that is running linux. I access this board through ssh on a wired connection. I have a usb-ethernet adapter on my machine, and then the ethernet cable ...
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Banshee wont authenticate for LastFM

Banshee will not authenticate for LastFM in Bionic. This happens even though I have logged into LastFM successfully and I know this as I can access my LastFM account through Banshee. I have installed ...
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Authenticate failure for software updates. New install of Kubuntu 20.04 alongside Windows 10

The system will not accept my password created at install. I have researched this error but do not understand how to proceed. The answers I get are way too technical for my knowledge. I am a first ...
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Starting to learn linux [duplicate]

I have windows PC with a VM installed. I installed Ubuntu 20.04 to learn Linux. I am unable to install anything due to an Authentication required. I have seen there is a way to disable this ...
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History and autocompletion do not work in SSH PAM session (openssh-server, libpam-ldap and nscd)

I configured a Linux Ubuntu 20.04 LTS VM, to authenticate users in the LDAP base and it worked correctly, however, when trying to repeat commands already executed, as we normally do in Linux, pressing ...
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login as user X rejected

Adding a user like so: sudo useradd juliet -p juliet -s /bin/sh and then typing su - juliet Password: Get the error: su: Authentication failure Why? And how do I change user?
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Gitkraken sing in problem with GitHub Account ( Could not Connect to Server)

I have installed the GitKraken form the Ubuntu Software android App, But for connecting to GitHub Servers i get the below error: **Could not connect to server** But for trying to signing by the ...
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Need guidance to understand setup of SSHD password / pubkeyauthentication

I'm an average admin supporting my own systems, not getting paid to be a professional. I've setup many systems for SSH with passwords and with private keys. This one is weird. I don't necessarily want ...
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I'm being haunted by an “Authentication dialog” and need help

Like the title says I'm being haunted. No matter what I fill into the damned prompt it says the information is wrong and asks if I want to try again. It just won't stop. Here is a picture of the ...
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76 views

Disable Smartcard Integration in Hirsute?

Getting smartcards to work right has been difficult and now it's fubar again. I'm currently trying to figure out, exactly what changed with the upgrade to 21.04. So far I've found this: Smart Card ...
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Autounlock/Autoreset SSH Auth on Ubuntu Server

are there any tools which cover the following scenario: You have the situation that you have elimentated all ssh accesses by accident and literally no one has access to the server via ssh. Everyone ...
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Can't connect via SSH / : UNREACHABLE! =>

I am trying to deploy a Leihs instance but facing issue while connecting to the server via ssh. My local machine is a MacOS 10.15.7 and the remote server an Ubuntu 18.04.. I created a key on my local ...
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cracklib allows passwords even if substring of the password is within the dictionary

I am using PAM and cracklib for password validation, the words defined in the dictionary of known words if used as substring of password should be rejected by cracklib and pam module. When the word ...
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Fingerprint reader fails in 9 out of 10 times

I'm using Ubuntu 21.04. The procedure for recording fingerprints works alright. Pam authentification works too. According to lsusb I get Bus 001 Device 006: ID 04f3:0c28 Elan Microelectronics Corp. ...
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Remove DUO auth completely from ubuntu server 18.04 - two factor auth

I have an Ubuntu 18.04 server with DUO authentication. This DUO interferes with my capistrano deployment (rails app) For such, I have removed duo auth with sudo apt-get remove duo-unix Then I logged ...
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Multiple issues: Not regnizing second monitor, authentication failed & no Power Off

I am facing three issues with my Ubuntu 20.04 installation on a laptop All a sudden my OS has stopped recognizing my second monitor connected through HDMI. The following login screen appears up ...
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SSH login failed for only one user

I have a few users using ssh ppk to authenticate, which used to work smoothly untli recently. Now for all the users everything is fine, except for one. When trying to authenticate, we get no supported ...
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Ubuntu 20.04 keeps asking for authentication

It doesn't matter how many times I give it the password, it keeps randomly popping up again. Also, I can just cancel, and it will work fine for a (short) while, then pop up again. How do I make it ...
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Can SSH/PAM be configured to allow for password + 2FA or public key authentication alone?

Is it possible to configure PAM/sshd to allow for either password + 2FA authentication, or SSH key authentication? This would make it possible to login from anyway securely but from a main PC it ...
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ubuntu connect to win08r2 adds

I cant authenticate win ADDS users on ubuntu 18.04 If I try to do it from terminal su -l username terminal returns su: Authentication failure but if I give sudo permissions via sudo -i and then ...
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108 views

Su command authentication failure on Ubuntu 20.04 LTS

I have been operating Ubuntu 20.04 LTS remotely. To run a shell script suited for tcsh environment I had to change my shell from bash to tcsh. I did it using chsh command being in the root. However, I ...
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86 views

Domain AD users aren't get discovered after adding Ubuntu under AD domain control

I've Joined a my ad domain with my Ubuntu 20.04.2 LTS VM (I followed this doc) and I'veJoined the AD domain with Ubuntu as sudo realm join -U Administrator win2016.local realm list show below output ...
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Dovecot 1:2.3.7.2-1ubuntu3.3 not logging failed authentication on Ubuntu 20.04.2 LTS server

I am running Dovecot 1:2.3.7.2-1ubuntu3.3 on Ubuntu 20.04.2 LTS server. My postfix/dovecot self hosted mail server works fine! I can send and receive mail without any problem. All the packages ...
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No problems logging in, but sudo gives authentication failure

So to start things off I have had a server running Ubuntu 18.04 for the last two years or so running just fine. I was logged in to it last night copying some files to my NAS and doing a few other ...
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Wifi problems Ubuntu 20.04

I have Ubuntu 20.04 on my Lenovo laptop. Sometimes an error window pops up and shows me that authentication is required for Wi-Fi: When I hit the Connect button it still pops up after a couple of ...
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“sudo -i”, “sudo su” and “su” commands not working - Ubuntu 20.04 LTS

When running sudo -i i get sudo: 5.8: command not found, sudo su outputs su: failed to execute 5.8: No such file or directory and su outputs su: Authentication failure I have no idea what may have ...
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411 views

pulseaudio Denied access to client with invalid authentication data

keep getting repeating pulseaudio message in syslog! Mar 2 18:43:14 itc2 pulseaudio.pulseaudio[27388]: W: [pulseaudio] protocol-native.c: Denied access to client with invalid authentication data. Mar ...
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533 views

FATAL: password authentication failed for user “postgres” Ubuntu v20.10

I already installed pgadmin4 following https://www.pgadmin.org/download/pgadmin-4-apt/ documentation on ubuntu 20.10. I created a user with an email and a password, then I logged and I got into the ...
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Login authentication error

Unable to login. Screen shows my name above oscillating password box. Authentication error notice. Unable to enter password This was after failing to install update hplip. Lookup suggested first ...
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86 views

What is causing this Authentication Required prompt in 20.04.2

I have this authentication required prompt that keeps coming up in a 20.04.2 install. I'm not sure which application or service is causing it to trigger but when I enter my password and press ...
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WiFi keeps asking for authentication, auto authenticate?

my Linux only machine will drop my campus WiFi on a consistence basis and ask for authentication. This can happen multiple times within a minute or a few times in an hour. Im pretty sure its something ...
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155 views

Many Authentication requests on startup, NOT remote

I am on Ubuntu 20.10, quite a "fresh" install. Very recently, every time I start the computer, I have to enter my password around 6 times, generally 1 Keyring thing, and many "...
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KRB5 preauthentication failed

I try to authenticate on a Ubuntu 20.04 server joined to a Windows 2012 R2 AD domain, but it fails with "Preauthentication failed" errors. I have configured the Ubuntu server the same way I ...
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PAM-CGFS Error: cgroupfs v1: Failed to initialize cpuset

My auth.log file is full with Feb 21 00:59:50 server PAM-CGFS[85778]: cgroupfs v1: Failed to initialize cpuset Feb 21 00:59:50 server PAM-CGFS[85776]: cgroupfs v1: Failed to initialize cpuset I have ...
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294 views

Authentication Required Popup

Edit: The popup problem is caused by Chrome Remote Desktop. When I uninstalled it, the problem is resolved. However, I want to have this app. How can I manage to have it without seeing disturbing ...
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Help! cant seem to get 2FA to work for my AWS ec2 SSH

Hi I have tried the solution online to include a 2FA system inside. even after I log out it still doesn't require a 2FA and log in as long as a PEM is present and I am not sure what I am doing wrongly ...
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29 views

Authenticator app based 2 factor authentication

a lot of software allows me to log in using code from the Authenticator app in my phone. Can we do something like that with Ubuntu 20.04 too ? I presume we would always need an internet connection to ...
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PAM pwhistory module is not prompting for choose another password if password has been already used

I want set history password reusability limit. I am trying to use pwhistory pam module. Below is configuration in /etc/pam.d/common-password file in Ubuntu (VERSION 20.04.1 LTS) password ...
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180 views

Samba with LDAP auth stopped working when upgrading Xenial to Fossa

We run an open source Java web application, which provides the users with a Windows file share to upload lots of big files. When a new user account is added, the web app writes a user record to a ...
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trying to update 16.04 to 18.04 ubuntu: Authentication error

I am trying to update a computer with Ubuntu 16.04 installed, but I get an authentication error, when trying to upgrade with the do-release-upgrade command. $ sudo do-release-upgrade Checking for a ...
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80 views

Software & Updates permission failed

OS: Ubuntu 18.04.5 LTS x86_64 Kernel: 4.15.0-135-generic DE: MATE When i run Software & Updates i get the following error: You are not allowed to perform this action You don't have the required ...
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Just installed Yubico Yubikey for multifactor autentication and my MS Hotmail account in Evolution is suddenly failing authentication

I have just installed Yubikey and the authentication works for everything except now I have an authentication issue with my MS Hotmail account in Gnome evolution. I have uninstalled and re-added the ...
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57 views

su Authentication failure when switching to non-root with password

I know the password of gqqtest as I can login via ssh. > psftp gqqtest@172.25.9.11 Using username "gqqtest". gqqtest@172.25.9.11's password: Remote working directory is /home/gqqtest Now ...
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Authentication popup stopped showing, Discover shows “Failed to obtain authentication”

I now face the exact same issue my 18.04 and 20.04 installation suffer from. I'm currently on 20.10 and the issue I have is that when I open Discover to update apps it always comes up with "...
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283 views

802.1x wired password Authentication loop in ubuntu 20.04.2 LTS

I am student in a university. When I try to connect to the LAN using 802.1x password in ubuntu 20.04.2 LTS version(kernel 5.4.0-58-generic) it pops in a loop asking me that the authentication requires ...
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127 views

PAM debug logging to Journal

I need to debug how the PAM authentication process of an appliation with my custom PAM module is executed. I'm using this for the Exim mail server on an Ubuntu 20.04 server and have created my own PAM ...
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267 views

LDAP authentication on Ubuntu 18.04

context I'm trying to configure LDAP authentication on an Ubuntu 18.04 machine. steps to reproduce In order to do that, I followed the following steps: apt install sssd libpam-sss libnss-sss create ...
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178 views

Mutt won't let me send emails because “Sasl authentication failed”

I've installed all the required packages for mutt to send emails smtp. mutt -v Mutt 1.13.2 (2019-12-18) Copyright (C) 1996-2016 Michael R. Elkins and others. Mutt comes with ABSOLUTELY NO WARRANTY; ...
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466 views

Can not login to SDDM using fingerprint on Kubuntu 20.10

Recently I've bought Lenovo ThinkPad X1 Carbon Gen8. Everything seems fine except one thing - I can't fully configure fingerprint reader. I've followed guide https://askubuntu.com/a/1082465/249099 and ...

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