ssh login without password

To access root user privileges in Unix,

sudo su
## prompts for password and grants access

sudo su -
## switch as root user without password

If you have to work with older versions of Rails, there might be discrepancy between the versions of Rails and Rubygems. Theats when you likely see the below message when you try to boot your rails app.

/home/lt-pc-528/.rvm/gems/ruby-1.8.7-p...

detect method in ruby returns the first item in the collection for which the block returns TRUE and returns nil if it doesn't find any. It has an optional argument containing a proc that calculates a “default” value — that is, the value to return ...

In ubuntu, you have a variety of window managers to choose from. Though Ubuntu 12.04 comes with Unity as the default you can switch back to Gnome, or choose other managers like Cinnamon.

If you want to know, which window manager you are running c...

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

```...