Questions related to the sudo command that allows users to run programs with the privileges of a different user (normally the root user).

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4
votes
1answer
6k views

sudo does not ask for password [duplicate]

Whenever I issue command sudo apt-get install foo it does not ask for password. is it because of user groups? How to make it prompt for password? Edit: My sudoers file apple@Ascension:~$ sudo cat ...
2
votes
3answers
15k views

Cannot authenticate without a password

The problem can be reproduced as follows: When I remove the password of an administrator account, "Log In without Password", I cannot use that account to authenticate. When I do something that ...
1
vote
5answers
3k views

changed /etc permission in oneiric (ubuntu11.10) by using “sudo chmod 665 /etc” cant use sudo now

I screwed up big time. I changed the permission of /etc in ubuntu 11.10 by using following command sudo chmod 665 /etc now when ever i try to use sudo it gives the following error: sudo: can't ...
4
votes
3answers
39k views

How to run applications as root?

I am having some strange issue with Kate and Kwrite. When I click on Open File, it crashes with segmentation fault. I am a complete newbie to Linux, and I think the issue is that I am not running ...
3
votes
2answers
2k views

How can I re-instate my admin privileges?

I am running 12.04 LTS. It's a pretty default installation and is the only OS on this machine. I have two users one has administrator rights the other does not. I accidentally removed administrator ...
28
votes
5answers
57k views

How to launch application as root from Unity Launcher?

Mainly I am looking for a way to pin an application to the Unity launch bar, and run it as root. Currently, even if I start the application with sudo, and pin it after it starts, it will start as ...
18
votes
3answers
57k views

How to configure ADB access for Android devices?

I'm using Ubuntu 12.10 and I have installed Android SDK, set it's path in my user .bashrc and it works. The problem is that my phone requires adb to be ran by root for permissions, but running adb ...
12
votes
1answer
3k views

How to configure pkexec?

Reading these questions and answers: When to use pkexec vs. gksu/gksudo? Why is gksu no longer installed by default? brought me another one that will create problems for new users of that ...
19
votes
2answers
19k views

Why don't I have a password for “su”? Problems with “sudo”

I have installed Ubuntu using the GUI, giving myself a password and everything. I do not intricately remember the process. However, what worries me is that I don't know the following password: $ su ...
3
votes
3answers
12k views

Can't open Gedit as root

When I run sudo gedit /path/to/some/random/file I get the following error ** (gedit:6262): WARNING **: Command line `dbus-launch --autolaunch=7f8731869e1c690b8205727e0000000a --binary-syntax ...
8
votes
2answers
11k views

Enable passwordless sudo as a specific user

I have two users on my system: itsadok, my main user, and elasticsearch, a user with a different ulimit for running ElasticSearch. I would like to be able to run stuff as the secondary user without ...
7
votes
5answers
17k views

How do I fix a “E: The method driver /usr/lib/apt/methods/http could not be found.” error?

I tried updating my packages from the terminal and this is what I got: $ sudo apt-get update E: The method driver /usr/lib/apt/methods/http could not be found. E: The method driver ...
2
votes
2answers
3k views

Graphical authentication works; why does sudo say my password is wrong?

I'm trying to install a theme, and when I enter the command sudo cp -r $HOME/Desktop/Overglossed /usr/share/themes the terminal asked for my sudo password which I entered, however I'm told my password ...
19
votes
3answers
4k views

Remove note about sudo that appears when opening the terminal

Whenever I open the terminal, To run a command as administrator (user "root"), use "sudo <command>". See "man sudo_root" for details. appears before the terminal. How do I get that to go ...
11
votes
1answer
11k views

Cannot lock '/etc/group' in recovery mode

I've currently booted into recovery mode, because I removed my sole user from admin :/ When I run adduser oadams admin, I get gpasswd: cannot lock /etc/group; try again later. For what it's worth, ...
5
votes
1answer
3k views

I accidentally removed myself from sudoers, how can I fix this? [duplicate]

I have one admin account and recently I have accidentally added myself to a single group (usermod -G without -a). So, I am not in the sudoers file any more. However, it is not possible to log in to ...
3
votes
2answers
4k views

Won't execute terminal commands

I have been using Ubuntu 12.04 for quite a while and have never had a problem come at me out of the blue like this. I'm trying to install python 3.2 on my Ubuntu system and every time I run the code ...
6
votes
2answers
11k views

How to solve “sudo: /etc/sudoers.d is world writable”

How can I fix the following error with sudo? /etc$ sudo sudo: /etc/sudoers.d is world writable usage: sudo [-D level] -h | -K | -k | -V usage: sudo -v [-AknS] [-D level] [-g groupname|#gid] [-p ...
4
votes
3answers
8k views

How do I run an executable file with a double click?

I'm trying to run an executable (testdisk) but double click doesn't work. The only way is to run: sudo ./testdisk from terminal. But I'd like to open executables with double click in future. How ...
71
votes
9answers
6k views

Run same command again but as root

Sometimes when I run a command I don't notice that I needed to run it as super user to have enough permission. Is there a way to run the same command again but as a super user?
19
votes
4answers
8k views

Is the difference between sudo and gksu the same as the difference between sudo -i and sudo -s?

Is the difference between sudo cmd and gksu cmd, the same as the difference between starting a shell with sudo -i and sudo -s? ... or put another way, Is sudo cmd the same as sudo -i cmd and gksu ...
23
votes
8answers
6k views

Why it is sudo?

Why we use sudo to perform a terminal command as an administrative, why it isn't admin or something else, is there a reason for sudo?
6
votes
1answer
948 views

How to configure pkexec to not ask for password?

I have a GUI application that needs to call a daemon (written in Python) with superuser privileges. I would like to do this without prompting the user for a password. Since the daemon is a script, I ...
12
votes
3answers
3k views

How to cancel the currently-applied remaining sudo time-out?

When I've just run sudo, and don't want it to remain active for the normal duration of its time-out, how can I cancel that remaining active time-out? sudo -k kills it for the current terminal ...
3
votes
3answers
10k views

'sudo' not working after changing the permissions of '/usr' directory

Recently I had to change the folder permissions of /usr folder. Now the whole sudo is not working. If I try to update my system using this command: sudo apt-get update I get the following message: ...
12
votes
3answers
27k views

Disable sudo permission to user from command line

I have activated root user in ubuntu and want to use ubuntu as server with no DE. For this I want to disable sudo privilege given to first user. How can I do this from command line ? I know I can use ...
11
votes
2answers
7k views

What does sudo service do?

As far as I know and it seems that other people have the same opinion sudo is a command that executes something with administrative privileges. However when I run rcconf I can see this line: [*] ...
14
votes
1answer
18k views

What exactly does sudo apt-get -f install do?

I have seen it before. I am just wondering what exactly does it do?
11
votes
1answer
1k views

Why I have to type my password after exiting a sudo -i session?

sudo -i in the terminal will made normal user into root user & after changing into root user if we exit then again we will be back to normal user.If we try again , next time it directly takes me ...
1
vote
1answer
1k views

Running a program as another user without typing a password

I'm trying to mark my browser internet traffic with a DSCP by selecting the packages with a certain owner. In order to do that I have to start my browser with a dummy user. I start my browser by ...
8
votes
1answer
2k views

Why should I use gksudo for Gtk apps instead of sudo? [duplicate]

I read somewhere that people should use gksudo for applications that use the Gtk GUI instead of sudo? What's the reasoning for this?
6
votes
2answers
5k views

Password not working in Graphical Applications (gksu)? Works with sudo

I am having a problem where when I try to run say GParted, when I am prompted for a password, it says "Incorrect Password" But when I enter the same password using terminal sudo gparted for example, ...
2
votes
1answer
731 views

Block a command from sudo user

I don't need an administrator to change my root password. I don't want any sudo user to execute this command: sudo passwd $root I have tried it in the sudoers file using the following command: ...
4
votes
2answers
2k views

Standards accounts are able to get root access using sudo without password request

I have installed a particular software using the installer present using the command sudo ./install.sh. After the installation now all the accounts on my ubuntu laptop can gain root access by ...
1
vote
3answers
10k views

Sudo not available in guest login

When I login as guest I am unable to execute any command with sudo. E.g.: sudo ps returns: sudo: unable to change to sudoers gid: Operation not permitted How can I fix this?
0
votes
1answer
446 views

Cannot undo sudo chmod 655 /

I've accidentally run 'sudo chmod 655 /', and now I cannot undo this operation again because I cannot access sudo anymore. I'd actually wanted the permission to be set to 755. Is there any way I can ...
54
votes
7answers
4k views

What does `!!` mean in `sudo !!`?

I am a user of Ubuntu with not much experience and I have been using sudo. What does sudo !! do and how?
13
votes
2answers
2k views

Why do I need root privileges to umount a drive at the command line, but not in nautilus? How to change?

When I insert a thumb drive, media card, or USB hard drive, to unmount it via the command line, I need to use sudo umount /media/the_device But, I can unmount the device in a file manager like ...
9
votes
4answers
2k views

Why does echoing these parameters with sudo not work? [duplicate]

Possible Duplicate: sudo & redirect output These are suggestions given by powertop to save energy: echo 1500 > /proc/sys/vm/dirty_writeback_centisecs echo 1 > ...
54
votes
7answers
4k views

Can sudo be reinstalled after being removed?

This seems to be a chicken-egg problem. The most common task using sudo is installing and removing software. sudo apt-get purge <appname> But sudo itself can be removed. sudo apt-get purge ...
31
votes
3answers
18k views

Why doesn't `sudo cd /var/named` work?

I want to cd into /var/named but it gives me a permission denied error, and when I want to use sudo to do this I am not permitted. What is the technical reason for this, and is it possible to do this ...
29
votes
5answers
5k views

What's wrong with using sudo?

In a comment here I've been told that unnecessarily using sudo should be avoided. While it wasn't needed in that particular case, I don't see any harm in using it. I think that when executing trivial ...
11
votes
2answers
49k views

How to give nopasswd access to multiple commands via sudoers?

Below is what I know: I have to add this below line in sudoers file to give rights to the user for particular task. user_name ALL=NOPASSWD: /usr/bin/apt-get install In this case I want to give ...
11
votes
1answer
7k views

Is it possible to give sudo access to only a particular command?

Background: I have a development machine with LAMP setup. Several developers would access the machine from time to time. Every time they make some change in a configuration file they will need to ...
9
votes
3answers
17k views

Error after sudo-ing “sudo: must be setuid root”

On a colleagues computer, everytime I use a sudo command, I get this error: sudo: must be setuid root I tried various things mentioned on the internet, like changing the permissions to 4755 from a ...
5
votes
1answer
9k views

how to shutdown a linux machine, including the root password, in 1 line?

How do you include the root password, say for shutting down an ubuntu machine? like, sudo shutdown now is it possible to include the password on this 1 line? like an extra parameter? reason for ...
9
votes
2answers
164 views

Run only parts of a script as sudo, entering password only once

I am writing a script (actually a combination of scripts and makefile) that installs external dependencies: some apt-get commands, some git cloning, building, installing, adding users to groups, ... ...
8
votes
3answers
17k views

Mounting filesystem with special user id set

I want to mount the device /dev/sda3 to the directory /foo/bar/baz. After mounting the directory should have the uid of user johndoe. So I did: sudo -u johndoe mkdir /foo/bar/baz stat -c %U ...
7
votes
3answers
18k views

How to execute sudo commands with Expect & send commands in bash script?

Can any body let me know how to execute sudo commands with expect. I tried the following but this is not working. Can anyone give me suggestion please? set login "sasuke" set addr "hostname" set pw ...
5
votes
2answers
9k views

Run apt-get without sudo

This might be a very naive question, but I wanted to know how I could give multiple users access to a single computer without making them root users. How would I give them limitted sudo access such ...