SUDO not working

sudo: /etc/sudoers is mode 0640, should be 0440?

When a similar message appears when you try to run sudo on your machine, the problem is likely with the permissions of /etc/sudoers file.

Try running

pkexec chmod 0440 /etc/sudoers

The command asks for password. Check if it ran successfully by typing

echo $?

Upon successful execution, sudo should be working on your machine.

sandheepg.wordpress.com

Sandheep

Say thanks

Last edit

Over 8 years ago

Sandheep

Network manager says wired network device not managed

If you have any trouble in accessing internet using your wired connection and while troubleshooting, if your network manager says that "device is not managed", open the terminal and follow the below steps to fix the issue.

sudo vim /etc/Netwo...

/etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf

Use following command and answer YES to enable dynamic updates:

sudo dpkg-reconfigure resolvconf

Do a system restart after that.

ssh login without password

Nothing new .. just a note to self about how easy this is

> ssh-keygen [Enter] [Enter] [Enter]
> ssh-copy-id -i ~/.ssh/id_rsa.pub user@remote-host
> ssh user@remote-host

Adobe flash player installation in Ubuntu

This is to install adobe flash player in Ubuntu 14.04 or higher. This works for Firefox browser.

If you have a 32-bit OS, run

sudo apt-get update
sudo apt-get install flashplugin-installer

Make sure each of the commands executed success...

Adobe flash player installation in ubuntu chromium browser

For Chromium browser versions greater than 34, to use flash one must install Pepper flash.

For Ubuntu 14.04 or newer, run

sudo apt-get install pepperflashplugin-nonfree
sudo update-pepperflashplugin-nonfree --status 
# to see what version of...

||= operator in Ruby

x ||= y is similar to x || x = y.

In the above statement, if x evaluates to logical true then assignment is not done.
If x evaluates to logical false only then the assignment is done.

Though the above two statements are similar, there are...

using ack in place of grep

To use Ack, make sure you have Perl installed and run the following commands in Ubuntu

sudo apt-get install ack
sudo apt-get install ack-grep

Now you can use ack-grep command to search for matches in the files

ack-grep -i some-text
#...

Class_eval and Instance_eval

class_eval is called on a class object and is used to create instance methods for the class at runtime.

%w(administrator developer teamlead tester).each do |user|
  class_eval <<-EOR
    def is_#{user}?
      site == "MYACCOUNT_#{org.upcase}" ...

Posted by Sandheep to Sandheep's deck (2015-12-17 06:37)

SUDO not working

Related cards: