Questions tagged [authentication]

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

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Ubuntu Server 22.04 Repository is no longer signed [duplicate]

I own a computer hosting a minecraft server on ubuntu server 22.04 but when I try to update using sudo apt update or any apt command it replies with Get:1 http://us.archive.ubuntu.com/ubuntu jammy ...
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Any way to guess the active keyboard layout of the "authentication required" dialog?

Because it darkens the rest of the screen and I cannot see the keyboard layout indicator. Right now my workflow is as follows: Type the whole passphrase. Press Enter. Wait for several seconds. Get ...
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Authentication error after lid reopens

I am currently using Ubuntu 22.04 LTS whenever I reopen the lid after suspending, I get an authentication error and many of the icons disappear. I can only shut down using the power button when this ...
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AUTHENTICATION REQUIRED: An application wants access to the keyring "Default Keyring", but it is locked. Can I disable this?

enter image description here AUTHENTICATION REQUIRED: An application wants access to the keyring "Default Keyring", but it is locked. Can I disable this? It keeps popping u
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Fingerprint option is not visible in settings in Ubuntu 22.04

I am using Ubuntu 22.04 in my Mi Notebook Ultra and I am unable to see the Fingerprint option under Settings>Users. My settings page look like this - enter image description here Following is the ...
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Ubuntu 18.04 asking for password to restart system

So I have may problems with Ubuntu 18.04, dummy Output, which I tried to solve using the many guides that I found on the internet, none of them worked and now if I try to restart the computer it is ...
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33 views

Disable darkened / shaded screen on Authentication Required prompt?

When the "Authentication Required" window appears, everything behind it, and everything on other screens, are darkened. Is it possible to disable this shading effect? Example
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authentication require to perform file operation - Ubuntu 22.04

I am new to Ubuntu and learning it from many days. I have used 2 hard drives in my system (sda for data, sdb for Ubuntu os) . One for Ubuntu OS & other for data. Problem I am facing is the ...
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`wget`: Cookies doesn't authenticate

I got some cookies from my browser where I'm well authenticated into a website. I've tried to give them to wget and make it download some internal pages, but all it downloads is authentication page
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How to add a new user on ubuntu server with password authentication turned off?

I have a ubuntu server with password authentication off. Now I need to add users for other people. However, since the password authentication is disabled, they could not log in to the server. One ...
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Logged out immediately after login using Active Directory on Ubuntu 22.04

I am installing a new Ubuntu 22.04 desktop, following the canonical instructions here for adding the computer to the domain, adding it to the domain during installation. The machine is able to pull ...
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Your authentication attempt was unsuccessful (for sudoer)

After installing Ubuntu I have created a new user and gave it all privileges in /etc/sudoers: user2 ALL=(ALL:ALL) ALL However now user2 cannot do admin tasks from GUI, like formatting a disk ...
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SSH login does not work after enabling 2-factor. Getting failed to read ".google_authenticator"

I have a server running Ubuntu 20.04 and I wanted to try to set up 2 factor authentication to secure SSH logins. I logged in to my server, and followed this tutorial: https://www.rosehosting.com/blog/...
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Can't press authenticate button at Authenrication Required. Ubuntu 20.04

Installed Ubuntu 20,started installing all necessary programs and appears Authenrication Required pop-up, a few times it works after I press authenticate button and write password, but from some ...
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237 views

Ubuntu 22.04 SSH smart card authentication, how to make enable-ssh-support flag work?

I'm trying to setup SSH authentication with smart card reader in a clean Ubuntu 22.04 install. When ssh it doesn't try to authenticate using smart card reader but it just says "ec2-user@myserver....
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the login keyring did not get unlocked when you logged into your computer - Without Auto Login

i know this is a repeated question but in may case Auto Login is not turned on. instead i have enabled Fingerprint Login and enabled Fingerprint Authentication module using pam-auth-update. so i use ...
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Logging in to Ubuntu 20.04 LTS server with SSH gives the following error

I've recently reorganised my SSH keys so that I don't have one single SSH key that would give access to all of my servers if it ever got compromised. This obviously means I need to upload the public ...
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Authentication required Unable to login after up gradation to Ubuntu 22.04

Recently i have upgraded my system to Ubuntu 22.04 but i am not able to login where i get below messages while system boot up Message 1 ) [0.133920] ipmi:dmi; Base addresss is zero,assuming no IPMI ...
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Buttercup desktop won't authenticate google drive

Ubuntu 20.04. Buttercup (Buttercup-linux-x86_64.AppImage). Open it, click on add a vault, select google drive, click Authenticate, new web page opens (in Chrome), I input my credential, continue, a ...
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6 votes
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Make the webcam take a picture when an incorrect password is entered or "wrong fingerprint scanned"?

I'm using laptop. And I want to take a photo when an incorrect password is entered or "wrong fingerprint scanned". I just found a question/answer about first part (Can I make the webcam take ...
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Ubuntu login loops, unable to access root, sudo command throwing error

Ubuntu desktop version is 20.04LTS. I used a usb to make a bootable file.Then I see usb is not permitted by roots then I have done a little bit change on home folder that is opend properties and ...
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Spurious timeout before allowing me to log in or authenticate for sudo

Soemtimes when I use sudo at the command line, nothing happens for 20+ seconds. After that, the desired things happens, which is that I am told to swipe my finger on the fingerprint reader or, if that ...
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Password does not work after setting up google-Authenticator 2fa

Hi I have a server at home that I often connect to from my school but I wanted to give it an extra security boost. I followed this tutorial, https://ubuntu.com/tutorials/configure-ssh-2fa#1-overview, ...
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Is there any one-click authentication module for sudo for an already logged-in user?

I would like to find a (PAM?) module that allows me to confirm sudo in one click, instead of typing the password each time. Much like windows UAC, where the user is switched to a secure desktop where ...
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PAM adding faulty module: pam_pwquality.so

I get the error below after running compliance through CIS script using USG audit on Ubuntu Server 20.04.4 PAM unable to dlopen(pam_pwquality.so): /lib/security/pam_pwquality.so: cannot open shared ...
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Where does Ubuntu store the name shown in the authentication window?

I want to change my PC name in Ubuntu 21.10. I edited: /etc/hostname /etc/hosts and rebooted. Now I can find my PC using the new name and also the prompt shows it correctly. But when it requires an ...
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Clear stored webdavs credentials from Dolphin (Kubuntu) not in KDE Wallet Manager

I've previously added a webdavs remote directory targeting Nextcloud in Dolphin on Kubuntu 20.4.3 using an URI such as webdavs://user@local.domain:443/remote.php/dav/files/user/. Since then I've ...
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Unable to ssh into AD domain

I'm trying to join to an active directory domain from my Ubuntu machine 20.04 I followed steps that are mentioned here: https://computingforgeeks.com/join-ubuntu-debian-to-active-directory-ad-domain/ ...
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Why did I get this random pop-up?

So I woke up today and I am greeted with this. Authentication Required Authentication is required to run gvfsd-amin daemon Password Cancel ...
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241 views

Slow login with Active Directory on Ubuntu 20.04

I am running an Ubuntu 20.04 machine configured to use my organisation's Active Directory (AD) setup. There is a significant difference in the login time depending on whether I am connected to my ...
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1 answer
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How to manage several users and machine deployed in 3 locations?

How can I centralise the management of ~40 PCs that will be running Ubuntu Desktop 20.04 LTS? Those PC will be used by ~100 users (students, teachers and staff) in 3 different locations, so I expect ...
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Ubuntu 20.04 : Fingerprint authentication not available for all users [using fprintd somerville-millesa]

I am using Dell Latitude 7520 with Ubuntu 20.04 installed. I have enrolled my fingerprint via terminal using fprintd-enroll and have successfully enrolled my print. I am able to login to my machine ...
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424 views

Passwordless Login to Ubunto 20.04 with FIDO2

So i've setup passwordless thru FIDO2 by adding auth sufficient pam_u2f.so authfile=/home/me/.config/FIDO2/u2f_keys having followed the instructions on the yubico page to generate the u2f_keys code It'...
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1 vote
1 answer
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Ubuntu is asking for password for small things

When I turn on my computer, Ubuntu asks for authentication, as shown in the following screenshot: It asks for a password even when I try to switch Wi-Fi and every time I turn the computer off. There ...
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553 views

Public Key Authentication failing (server refused our key)

I'm trying to connect to my home server with public key authentication, but it is failing. I have connected this way for a long time without any problem, and now it's failing, but I don't know why. ...
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-3 votes
1 answer
397 views

How do I install apt on Ubuntu? [duplicate]

I'm trying to install Google authenticator on Ubuntu. I tried sudo apt install libpam-google-authenticator which results in the error sudo: apt: command not found. Shouldn't apt already be installed ...
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2 votes
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How remote IP address entries in the xauth list, which belong to a marketing company affiliated with my router's ISP could appear

How and why these entries could appear in the output of xauth list (.Xauthority file): 92.242.132.16:1 MIT-MAGIC-COOKIE-1 XXXXXXXXXXXXXXXXXXXXXXXXXXXXX 92.242.132.16:2 MIT-MAGIC-COOKIE-1 ...
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1 vote
1 answer
3k views

Permission denied (publickey).?

when I'm trying to connect to server get this error can you help me? thanks! ssh root@srv.alimd.ir -vvv OpenSSH_8.8p1, OpenSSL 1.1.1l 24 Aug 2021 debug1: Reading configuration data /home/njfamirm/....
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0 votes
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user-name is not in sudoer file and su authentication failure

when using sudo command, I met the error: "uers-name is not in the sudoers file, and this incident will be reported". And then I tried some answers in the internet, such as "su root &...
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SSH Randomly Disallowing Connection

I have several SSH keys on my ubuntu 20.04 host machine. They all can successfully connect to my vbox Debian 10.5 server using the following format: ssh -t -i ~/.ssh/id_rsa user@domain.com However, ...
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1 vote
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802.1x Wired Setting for PEAP and TLS Authentication

I am new to ubuntu. I recently set up a Freeradius in ubuntu and connected successfully with the supplicant's PC using MD5. I am using ethernet cable to connect these three items: two Ubuntu PC and ...
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How can I turn off the password on the Ubuntu lock screen

I'm running Ubuntu on a VM (host is Windows). I've got Ubuntu to autologin, and never autolock the screen. This is secure because I rely on the Windows host for physical security. However, when my ...
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37 views

Internet connection through command line

The system loses institute internet connection after some time due to session time out. How to bring it up using the terminal.
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1 answer
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Password authentication problem in KDE

I had installed fingreprintd to make fingerprints work on my machine but it didn't recognize my fingerprint reader. So I removed the package. I think that it changed some desktop configurations so I ...
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1 vote
1 answer
486 views

Need help on google authenticator on ubuntu

I have Ubuntu 20.04.3 LTS where I have successfully installed Google authenticator for MFA authentication, now I need a help on the steps of authentication, my goal is this: If a user has no ssh-key ...
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0 votes
1 answer
376 views

pam_mkhomedir.so not working with nslcd + LDAP (Active Directory)

I'm trying to get pam_mkhomedir.so to create an LDAP user's local home directory upon initial login. I'm on Ubuntu 20.04 LTS. Currently, users are added to my server via LDAP (Active Directory backend)...
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147 views

Missing value auth-url required for auth plugin password

As i am trying to configurate openstack, when already in pipenv shell, i get this error : Missing value auth-url required for auth plugin password, when i call commands like : openstack network list --...
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2 votes
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31 views

Sudo rights without sudo auth

I'm making an Ubuntu x86 Retropie. So far I have been able to figure out how to modify the OS to get all the hardware working but being a Windows admin I'm a little out of my depth on this one. Is ...
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Ubuntu Denies Active Directory Logon for Single User

I have an atypical conflict occurring with Ubuntu 18.04 or 20.04 resolving Windows domain credentials. The issue is limited to a single user, but their account works without issue from Windows devices....
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1 vote
1 answer
789 views

Password in /etc/apt/auth.conf gets rejected when password contains spaces and an exclamation point

In /etc/apt/auth.conf, I have the lines machine example.org/nexus/repository/my_apt_repo/ login my_usename password not my actual password 1! Attempting to run sudo apt update results in the error ...
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