Questions regarding passwords and the use of them. Where and when it is needed for system security.

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6
votes
6answers
21k views

How to change password using usermod?

I am superadmin of a server and like to change password of an existing user . How can I do that ? I tried usermod -p 'new-password' john but it didn't worked ?
3
votes
2answers
887 views

Wubi overwrites my Ubuntu username to Administrator and ignores my password

I know there are ways to get your root access back and change your password, but every time I try a new flavor of Ubuntu (installing using Wubi) my username/password is ignored. After installing and ...
4
votes
0answers
44 views

Is the lock screen secure?

I have a fully encrypted drive so I know when my laptop is turned off that nobody can access my data but what about when the screen is locked with my root password? It is often impractical to turn ...
11
votes
2answers
3k views

How secure is KeePassX?

I have hundreds of passwords, since I use a different random one for each website/service. They are all generated & stored with KeePassX, which can be synced to different computers and my android ...
-1
votes
0answers
18 views

i have forgotten my authentication for upgrade

how to reset my authentication password ( not log in password)? because without it i am unable to upgrade. I don't know what to try.thanks.
0
votes
1answer
25 views

Ubuntu 14 installing phpmyadmin newbie question

Okay did a search first, and a whole bunch of folks are having problems with this one however my problem seems to be reasonably unique ... i.e. am doing something obviously wrong. Am getting the ...
1
vote
0answers
36 views

My Ubuntu 14.04 does not accept one of the user account password, even in terminal, graphic mode or GRUB. How to fix it?

Lets me explain more, the password changing works well, like sudo passwd username when the message says successful, but after that, the user account continue without any password. I have others users ...
11
votes
2answers
4k views

Yubikey Two-factor Authentication Full-disk Encryption via LUKS

I recently acquired a Yubikey Neo - a nifty little hardware second factor authentication device. It's primarily intended for use with One Time Passwords, and the emerging U2F protocol - but since ...
0
votes
1answer
51 views

I have lost or forgotten my authentication password to my ubunutu 12.04 installed PC

I have lost or forgotten my authentication password to my Ubuntu 12.04 installed PC. I have followed the sudo passwd root command and punched in the new password. It gives me a message Authentication ...
0
votes
2answers
27 views

Why do all my accounts (on my computer) passwords look the same?

Why do all my accounts (on my computer) passwords look the same? You can see it here (I had to post on imgur because I couldn't post the 4 pictures here). The passwords all look the same but are they ...
3
votes
3answers
4k views

remember wireless password in kde

I've got kubuntu 12.04.3 LTS installed. Don't know why - whether it's a default option or I've made this - but KDE always keeps asking me for the wireless connection password and it's annoying a ...
0
votes
1answer
32 views

Password protection for command-line suspension

I found out how to suspend via command line, namely by sudo pm-suspend. What I miss there is that when the machine wakes back up, the sessions (all of them running in different tty's) are not ...
2
votes
2answers
407 views

Multiple hosts password problem using mpirun

So I am running a parallel c++ program by sending jobs from an Ubuntu machine to remote hosts (also Ubuntu), the command line I use on the terminal is something like: mpirun -np 4 --host host1,host2 ...
1
vote
1answer
29 views

Make locally compiled programs request password graphically

I have an application that I downloaded from my class' website for our custom avr robot and it requires root privileges to send our binaries to the robot via usb. When I try to use it with sudo, the ...
1
vote
0answers
86 views

Automatically connect an Openconnect VPN connection

I installed the network-manager-openconnect package and uses it to login to my Openconnect VPN server. The connection works, except that every time I start the connection a two step dialog box pops up ...
0
votes
1answer
49 views

I forgot my Ubuntu user password [duplicate]

I have only one user and my grub boot menu also won't load so I don't know any other way to change password
12
votes
6answers
8k views

How to extract saved password from Remmina?

I don't remember my password for one of my servers. I have a working connection saved and want to get the password from it. From Remmina faq: Q: How are my passwords stored? Are they secure? ...
0
votes
0answers
28 views

Ubuntu log in with pendrive instead of user and passwod

I would like to login to my computer without writing my password nor username, but only sometimes. The thing is I would like to configure my notebook to start up at certain hour and start at once all ...
1
vote
2answers
150 views

Can't save changes

I'm brand new to Ubuntu. I downloaded with Wubi and 13.04 shares my computer with Windows 7, (which hopefully will be deleted soon. Goodbye, Bill). First, can I toggle back and forth between Win7 and ...
0
votes
2answers
59 views

Locked out, but correct password

I started up this morning, only to find my password is not working and I am locked out. When I enter the correct password, or when I try to login as a guest, the screen resets and goes back to the ...
8
votes
3answers
9k views

How to set user passwords using passwd without a prompt?

I am writing a script to add a large amount of users to a system. Part of this involves setting default passwords for each user. How can I set users' passwords without it prompting me for the password ...
0
votes
0answers
26 views

Password not working on “Switch User” only

I have Ubuntu 15.10 x64, which was upgraded in a long series of upgrades going back to 9.04. Over time, many things (including most of the hardware by now) have changed. What has not changed, however ...
7
votes
1answer
54k views

Can't SSH in as root

I'm using the default installation of openssh-server for my Ubuntu 14.04 server. I can connect through the console as root like normal, with my username and password. When I try to SSH with the same ...
1
vote
1answer
35 views

how do i change the password prompt format

When i ssh to ubuntu thru putty using username, it prompts for password. I want to change the format of the word "password". below is the current format. Using username "kraj". kraj@x.x.x.x's ...
0
votes
0answers
33 views

Ubuntu 14.04 Login loop (variation)

Today I decided to install Ubuntu 14.04 LTS on my Windows 10 hosted Virtualbox. I installed some things, restarded the VM and got a login loop. It seems that the login loop in 14.04 is not a new ...
1
vote
2answers
54 views

after installing Ubuntu unable to access as keyboard shift key not working so unable to enter pw

I have just done a fresh install of Ubuntu onto the internal hard drive of my laptop. During the process of installing Ubuntu, I clicked the option to encrypt drive, and entered the same password I ...
1
vote
1answer
55 views

sudo passwd command with no-interactive mode

Context: I created a Virtual Machine with Packer for Vagrant system into a Ubuntu 14.04 server OS. All runs perfectly but this is a development VM (I'm alone on this) and I want to administer my ...
0
votes
1answer
31 views

How to deal with forgotten password without loosing any data from ubuntu based laptop? [duplicate]

When I logged in today on my laptop and tried to do something it asked me for my password. So i typed in my password and it keeps on saying that It's invalid. I know for sure I didn't change it. Is ...
0
votes
0answers
29 views

SeaHorse default uncheck “Automatically unlock this keyring whenever I'm logged in”

This is a little contrary to what many forum questions ask, but in my case I'm trying to get Sea Horse (the password manager) to default uncheck "Automatically unlock this keyring whenever I'm logged ...
0
votes
0answers
19 views

Where is a passphrase stored when I request “Remember until I logout”?

When you (with Nautilus or Nemo) access a resource that requires a passphrase you are presented with a dialogue that gives you the choices to forget password immediately remember password until you ...
0
votes
0answers
19 views

want to change password on ubuntu entirely in a single line with no prompt

echo somepassword | passwd --stdin someaccount does not work. Why not? I don't care that it appears in the process table for an instant or is recorded by process accounting.
0
votes
1answer
49 views

How Random Are Pwgen's Passwords?

I'm looking for a good password generator and I came across pwgen. Are the passwords generated using the pwgen -s -y command truly random? And would you recommend pwgen? Also, I am aware that some ...
5
votes
2answers
13k views

what rar password recovery tools are available?

Long ago I made an archive of images and protected it with a password but I have forgotten the password and I made many trails to crack it with my general combinations but failed. Are there any ...
1
vote
0answers
9 views

Please Help! Can't log into root Ubuntu 14.04 LTS [duplicate]

I am hoping someone can help me out here. For some reason my system has stopped letting me sudo. I can log into the machine just fine. When I attempt to install a package or sudo -i, I get asked ...
4
votes
2answers
9k views

How to save VPN passwords with NetworkManger for nmcli?

There are many posts about putting VPN passwords into /etc/NetworkManager/system-connections/<connection>. I can't get any of them working on Ubuntu 12.04. The fields in the questions and ...
4
votes
3answers
5k views

Assign VNC password using script

I am using a script to automatically set up a computer. I need to assign a password to the vnc server for the user, which is normally done using the vncserver command. However, it prompts for the user ...
3
votes
4answers
6k views

Root password needed

When I first installed Ubuntu 13.04 from a USB stick I was asked to fill in for user username and password so I set one on my own. When I run Ubuntu I click log in but it automatically logs me in as ...
3
votes
1answer
25 views

Reset or recover GNU screen password

I have a server where I wish to run a process using screen. I start a screen using: screen -S <screen_name> Detach using ctrl+a+d. But when try to reattach the screen using, screen -r ...
-1
votes
2answers
58 views

What is the name for root user?

Here is the scenario: Installing Ubuntu and when asked for root password, just left empty. Only entering the password for the normal user. Now, I want to connect to such OS remotely. I'm using ...
18
votes
5answers
180k views

How to change root password in ubuntu?

I am trying to change root password in my Ubuntu system. This is what I did: ashot@ashot-desktop:~$ sudo passwd root passwd: Authentication token manipulation error passwd: password unchanged ...
0
votes
1answer
29 views

How do I set a login password in Lubuntu

I thought this would be a common question but after searching for answers I couldn't find anything that addresses this exact problem. Anyway, I have an administrative password, so every time I want ...
0
votes
0answers
103 views

What is the default username/password in Ubuntu 15.10 (For developer Edition x64)?

I downloaded Ubuntu 15.10 x64 (filename: ubuntu-15.10-desktop-amd64.iso). I want to try it out, so I write it to my USB flash drive using Rufus-2.7 on Windows 7. (During the process of writing, Rufus ...
3
votes
0answers
52 views

Cron using a command that asks for password

I was able to fix this by using the encfs -S option, this pulls the password from a file instead of prompting for the password every time the script is run. This is not very secure as the password is ...
7
votes
2answers
1k views

Make the root the only one able to change the passwords of all other users

For security purpose, I want only the root to change passwords for all the other users. This will be achieved if I set /usr/bin/passwd to 700. Now, if password ageing is enabled or first login is ...
3
votes
3answers
71 views

How to prevent scripts/commands hijacking your session's cached sudo ability?

If I run a sudo command it will ask me for a password, however in that Terminal session for the next few minutes it will allow me to run sudo commands without asking me for a password as it will cache ...
1
vote
2answers
86 views

Where can I find my saved wifi passwords on 14.04?

Not trying to accomplish anything nefarious, just wanted to connect my tablet to my girlfriend's home network. My laptop already has it saved (connects automatically), but I've forgotten what it was ...
1
vote
0answers
62 views

How can I limit user login to a certain number of password attempts? Ubuntu 15.10

So basically I want to be able to set it to time out after a certain number of password guesses. If this is possible, would this apply to sudo command attempts as well?
0
votes
0answers
74 views

Unable to login to ubuntu 14.04

I have downloaded ubuntu 14.04 iso 32bit from ubuntu. I have made it to be bootable from USB. I have successfully[I guess] installed. Then it asked me my password. I have given the password which I ...
5
votes
2answers
205 views

ecryptfs and login passphrase vs mount passphrase

I installed ecryptfs-utils and used it to create a Private encrypted folder in my home directory. During creation of Private encrypted folder I was asked for a login passphrase and a mount ...
15
votes
7answers
13k views

After new Ubuntu 15.04 installation, startup asks for password even though no disk encryption was set up

I installed a brand new SSD into my laptop and did a fresh install of Ubuntu 15.04, with NO system encryption used (only Home directory encryption). However, it still asks me for a password when ...