Questions tagged [authentication]

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

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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 ...
Oomph Fortuity's user avatar
1 vote
1 answer
2k 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 ...
Matthias Ronge's user avatar
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0 answers
189 views

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 ...
j0h's user avatar
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1 answer
560 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 ...
Powermongur's user avatar
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236 views

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 ...
Daniel Grindstaff's user avatar
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1 answer
3k views

su Authentication failure when switching to non-root with password

I know the password of gqqtest as I can login via ssh. > psftp [email protected] Using username "gqqtest". [email protected]'s password: Remote working directory is /home/gqqtest Now ...
Gqqnbig's user avatar
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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 ...
Snehith's user avatar
1 vote
1 answer
2k 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 ...
E. Jaep's user avatar
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0 answers
2k 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; ...
Joshua's user avatar
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4 votes
1 answer
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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 ...
Dmitriy Vinokurov's user avatar
1 vote
0 answers
307 views

Passphrase-protected private key and automatic server directory mounting

I am learning sshfs on ubuntu 20.04, that is the client machine. I have turned on SSH key-based authentication. The Public key has been already stored on my server. I set the passphrase for protecting ...
TADASUKE's user avatar
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0 answers
353 views

SSH Ubuntu server not replying to mac client

I'm trying to connect to my Ubuntu server from my macbook client through ssh. Port 22 is open and the server is not behind a router. I've run sudo tcpdump -i any port 22 -n -Q inout The request is ...
Augusto Pereira's user avatar
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1 answer
42 views

How do host machine know about the private key in the machine which is doing ssh in it [ssh-copy-ip method ]

With this method: ssh -i private key [email protected] I am telling that here is my private key and ubuntu_A matches my private key with the public key in authorized_keys. I am confused with ssh-...
Aditya Singh's user avatar
1 vote
0 answers
193 views

Pop up keeps prompting for admin password on boot up

I keep getting a pop up requesting authentication with the following message: Authentication is needed to run /usr/bin/apt as superuser which if I am correct it sounds like apt is trying to do ...
TheXed's user avatar
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I followed an FTP setup guide to try and setup FTP and now I have to enter my password for every file I want to access

Yesterday I tried to setup an FTP server and I almost got it but no luck. Now all my permissions are screwed up. Whenever I try to access my video files I am asked for password authentication for ...
Eric Jakob's user avatar
1 vote
0 answers
2k views

Samba share without authentication Ubuntu 18.04 server

INTRO I'm going through the configuration of a samba standalone server on Ubuntu 18.04.5 server, virtual machine. Shared folders should be accessible without authentication. Accessing with windows 10 ...
GabrieleMartini's user avatar
5 votes
1 answer
6k views

Why is the fingerprint daemon started when there is no fingerprint reader?

Whenever I sign onto (or unlock the passworded screen of) a recently installed 20.04 system, /var/log/syslog reports that it is starting the fingerprint authentication daemon: … Nov 15 13:29:28 ray-...
Ray Butterworth's user avatar
10 votes
3 answers
20k views

"Authentication required. System policy prevents WiFi scans" in FocalFossa

For those of you bothered by the deluge of annoying popups asking to authenticate pretty much every move one makes in Focal Fossa ("System policy prevents this and that" when mucking about ...
Aqualung's user avatar
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1 answer
216 views

How to disable FIDO authenticator?

Whenever I run the command ssh-add -K ~/.ssh/id_rsa, I get a prompt asking for the FIDO authenticator pin. How do I disable the FIDO authenticator?
besrabasant's user avatar
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1k views

How do I forget my credentials for git from the command line?

I am trying to forget my credentials for git so I can close a repository using a PAT. ~# git clone [email protected]:your-username/atom.git Cloning into 'atom'... Warning: Permanently added the RSA host ...
UntoldDawn's user avatar
1 vote
1 answer
2k views

How do I bypass the "Password needs to be longer" warning while setting a new password?

I want to have a password Ubuntu but is says it's too easy to guess Can I bypass this?
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1 vote
1 answer
94 views

Why do I have to authenticate again with password after having logged in with fingerprint?

The fingerprint reader on my Thinkpad X1 Carbon 7th works well on stock Ubuntu 20.04. I use it for all day to day logins without problems. However, after having logged in with my fingerprint to my ...
Christian's user avatar
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1 vote
1 answer
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Enabling OpenLdap authentication in ubuntu 18.04

I am trying to enable LDAP authentication on my ubuntu client. So far I tried the following instructions: https://www.tecmint.com/configure-ldap-client-to-connect-external-authentication/ https://www....
Shadi Khosravi's user avatar
0 votes
0 answers
115 views

Ubuntu can't connect to Sophos Access Point

I cannot connect to Sophos Access Point, it's look like it not even there. My conf: Network logs: out 06 11:49:54 pl1772 NetworkManager[646]: [1601981394.7931] device (wlp2s0): Activation: (wifi) ...
Sérgio Marques's user avatar
0 votes
0 answers
98 views

How to remove user authentication when trying to open a file? e.g .JPG

I am using Ubuntu 20.04 LTS. I have recovered some files that were deleted in a HDD when I was using Windows some time ago. I used foremost to recover my files, but the output directory ask me to ...
Leniel Luzardo's user avatar
0 votes
1 answer
1k views

Username password authentication doesnt work as expected im mosquitto broker

Authentication with username and password doesnt work as expected in mosquitto broker..I am able to subscribe mosquitto_sub and publish mosquitto_pub to topics even if the username and password is ...
smitha's user avatar
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1 vote
1 answer
3k views

ssh: Cannot use pubkey authentication

I've been unable to ssh using pubkey authentication. I've been setting up a new server, and it just won't work. My changes to the default sshd_config are set with this: sed -i 's/#...
Troper's user avatar
  • 11
42 votes
2 answers
24k views

gvfsd-admin daemon authentication forces me to restart Ubuntu - VERY annoying!

I installed Ubuntu 20.04 on a new partition less than a week ago. I have not yet gotten all the basic stuff to work. But now, from time to time, 20.04 pops up a small window saying "...
Henrik R.'s user avatar
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1 vote
0 answers
1k views

Why is the ssh asking for password still?

I have generated an rsa key pair and am using it to ssh into my server without the need of a password. The server contains the file ~/.ssh/authorized_keys, into which I've copied the file in my client'...
zendevil.eth's user avatar
-1 votes
1 answer
96 views

I don't know the authentication password to download stuff [duplicate]

I got this computer from some one online and I don't know any of the passwords I manly need to just reset the authentication password is there a way to reset it without the authentication password
Mikey Herobrine's user avatar
0 votes
2 answers
555 views

Why does this users does not need PAM two factor Authentication for logging in?

I inherited a system from a departed colleague. He setup two factor authentication on the system, except for user root and ftpupload. However, there is this particular user who has SSH access but does ...
user1034912's user avatar
2 votes
1 answer
5k views

fprintd and fingerpring authentication does not work after enrolling my fingerprints on Asus Zenbook UM431DA-AM003

I bought recently Asus Zenbook UM431DA-AM003 and installed Ubuntu 20.04 (Focal). I was trying to enroll my fingers using swipe method (not touch) and it worked fine: ~$ fprintd-enroll Using device /...
Alimektor's user avatar
0 votes
1 answer
2k views

CUPS Printer Sharing authentication

I have set up printer sharing on a (local) headless ubuntu server running cups. My Question: Is there a way to add authentication (like username and password) to the shared printer, so only ...
Regor Jogal's user avatar
0 votes
0 answers
78 views

Multi-factor Voice Authentication

Was wondering if one could set up Multi-factor Voice Authentication along with traditional OTP based 2FA for logging in to their GNU/Linux, and superuser escalations. There are some posts from about a ...
computronium's user avatar
-1 votes
1 answer
36 views

Graphical login as user who has no password [closed]

I'm using MATE desktop on 19.10. I've made a user who has no password, and I need to log in as them with a desktop (setting up WINE so they can play games.) When I just enter the username and press ...
kel5isgod's user avatar
1 vote
1 answer
10k views

User is not in the sudoers file.The incident will be reported [duplicate]

I have just set up a Remote Desktop connection on Ubuntu LTS server and whenever I tries to install something a window prompts and asks for a password. I have tried the password but it’s not accepting ...
BHAVANSH ARORA's user avatar
0 votes
1 answer
1k views

530,5.7.0SMTP server error: MAIL FROM command failed Detail: Authentication Required

PHP Mail error with the message: 530,5.7.0SMTP server error: MAIL FROM command failed Detail: Authentication Required Following are the key sections of my PHP Script. new PHPMailer(true) Host as '...
Naren's user avatar
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0 votes
0 answers
285 views

Using different RSA keys for SSH

I've been silently learning from all of you for a long time. So thank you in advance for that! But now I got to a point where no google search can help with this issue I'm presented. I've found some ...
mariano-daniel's user avatar
0 votes
2 answers
573 views

Restoring sudo.config file to default

I had my laptop running pretty well, slowly going about the process of finding apps that would match what I'd been using on Windows. I cut and paste what I thought was installation for a Terminal ...
redbax321's user avatar
0 votes
2 answers
1k views

20.04 headless on Raspberry pi 4 re-install will not allow password authentication on ssh

I installed 20.04 on a new headless pi 4 - no problems. Using Raspberry Pi Imager and selecting 20.04 server each time. Decided to re-install for a clean production environment but the new ...
John Arundell's user avatar
2 votes
3 answers
937 views

SSH on Ubuntu 20.04 Windows 10 Subsystem ignores IdentityFile specified in .ssh/config

SSH flat out ignores the identity file I've specified in my .ssh/config file and will not use that key to authenticate with my work server. This is my config file: Host * # This is to fix ...
Nobilis's user avatar
  • 211
1 vote
1 answer
2k views

Unable to SSH to a local system; error (publickey, password), SSH key regeneration

I'm running Ubuntu 20.04 desktop and unable to SSH into it, getting the error(publickey, password). Here are the logs : ssh -vvv [email protected] OpenSSH_8.2p1 Ubuntu-4, OpenSSL 1.1.1f 31 Mar ...
Saki Osive's user avatar
11 votes
3 answers
2k views

Escape timeout for, or cancel sudo fingerprint authentication and revert to password

In systems where the fingerprint scanner works, you can enable sudo authentication in the terminal, so that you can swipe your finger instead of typing your password when you issue "sudo" in ...
Alex Kambas's user avatar
1 vote
1 answer
977 views

Understanding /var/log/auth.log - Confusion about "pam_unix" and "polkit"

I am having an hard time understanding some lines inside my auth.log file from Ubuntu. Can you help me breaking down the pieces of this one? pkexec: pam_unix(polkit-1:session): session opened for ...
Fra93's user avatar
  • 111
0 votes
1 answer
217 views

How To Use Key Authentication With More Than One User

I have an interesting issue with my Ubuntu box that I feel like is probably just a configuration issue on my part but hopefully one of you wizards can help me figure it out. I have an Ubuntu 18.04.4 ...
B-Dawg's user avatar
  • 355
0 votes
1 answer
2k views

how to Setup Grub Password ONLY to access grub menu?

Need help to configure Grub Password only for accessing Grub Menu. I DO NOT want to enter user name and password at the time of each reboot. I've configured Grub User ID and Password by following ...
Hrish's user avatar
  • 2,343
3 votes
1 answer
15k views

Fingerprint Sensor not working (Ubuntu 20.04)

I've just installed Ubuntu 20.04 yasterday on my ASUS F512D (also known as X512DA), and everything is working fine, i was worried about the Ryzen 5 3500U and graphics not working, but everything just ...
user avatar
0 votes
0 answers
325 views

OpenSSH-Server in Ubuntu 16.04

Problem connecting to server I can ping the server (Ubuntu server 16.04 no GUI) and the server can ping the desktop (Ubuntu 18.04). I have installled Openssh-server 7.6p1 on the desktop machine. The ...
Andy Carlile's user avatar
0 votes
1 answer
40 views

Thunderbird authentication failures after Firefox update

Today May 6, 2020 I was prompted to update Firefox software, which I did. Right after that, I get authentication errors when getting email on Thunderbird. I use email servers from two different ...
shawbapmp's user avatar
0 votes
1 answer
616 views

Help Understanding auth.log Entry

Recent Ubuntu (v 18.04) convert and trying to understand a auth.log entry. May 3 00:38:58 dug pkexec: pam_unix(polkit-1:session): session opened for user root by (uid=1000) May 3 00:38:58 dug ...
user1077035's user avatar

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