Speakers donot mute after plugging headphone in Dell Vostro

You can follow this link here
For me Downloading and installing driver (deb)  here  worked for me.

How to enable Wireless on ubuntu

Install following packages from repositories :
1> bcmwl-kernel-source
2> b43-fwcutter
3>bcmwl-modaliases 
After that reboot your machine. 
 

Forgot Windows 7 password

To reset windows 7 password , use Britec software.
1>http://www.briteccomputers.co.uk/downloads/BritecRecoveryConsole.iso
Download iso into pendrive(bootable)
2> Goto bios and change boot options.
3> On running britec goto password option and select on user whose password you want to reset.

History of commands in shell

Can be seen on bash_history file.
Can be found in /home/bharat/.bash_history

Grub Menu Timeout

1> sudo gedit /boot/grub/menu.list
2> set timeout (value in seconds)
rebot the system.

Macintosh on Ubuntu

We can get the feel and look of  Macintosh on Ubuntu.
Steps:
1> Download Macbuntu or mac4lin from sourceforge.
2> Install it from installation file ./install.sh (run it on terminal)
3> Also install dockey (if not provided in downloaded folder of macbuntu or mac4lin)
4> Customize it according to your need.

NOTE: Before installation make sure that you are using the appropriate version of ubuntu for which Macbuntu or mac4lin are compatible.

Password Reset in Ubuntu

1> During Grub loader press ESC
2> Go to Recovery Mode of Ubuntu
3> Select Drop to Root user
4> On terminal write passwd <username>
    It will ask for new password reset.