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DNS (Domain Name Server) is basically a system to convert domain names into IP addresses. Domain names are easier to understand, memorize and write for humans while computers only use IP addresses to communicate.

In most of the  case, Internet Service Providers  providing the DNS servers to the customer. User can change it, the  reasons to switch to other DNS servers for performance, privacy and censorship. Most of the people using OpenDNS as the first alternative, But Now Google Public DNS is available and the performance is much better.

Now How to set up Google Public DNS in Ubuntu

Select System–>Preferences–>Network Connections


Select  the type of connection you have. For this example, we will use ‘Wired’.
Under ‘Wired’, highlight ‘Auto etho’ and click on ‘Edit’.

Now,  Inside ‘Editing Auto etho‘ window, click on ‘IPv4 Settings’ tab. and select ‘Automatic (DHCP) address only‘

Put these nameserver addresses as your ‘DNS Servers’:8.8.8.8, 8.8.4.4

Click ‘OK’ and reboot your machine.

NOTE:

For avoiding  your settings get revoked after reboots, you may need to make the following changes via the command line:

$ sudo cp /etc/resolv.conf /etc/resolv.conf.auto
$ gksudo gedit /etc/dhcp3/dhclient.conf
# append the following line to the document
prepend domain-name-servers 8.8.8.8, 8.8.4.4;
# save and exit
$ sudo ifdown eth0 && sudo ifup eth0

Gboard is a small simple device for help gmail users. It is a USB device. The Gboard has 19 buttons and each corresponds with a task in Gmail. From the board, you can search, go to results, go to starred mail, compose a message, reply, reply to all, forward a message, star and archive messages, delete and mark messages as spam, flip through your messages , select messages and go right to the inbox.

X-tile is a useful gnome applet for your panel (or optionally a standalone application) that allows you to select a number of open windows and tile them in different ways. This is especially useful for comparing products in separate web pages,or for programmers refering to documentation as they are programming.
Download .deb file from here
now double-click on deb file and install with gdebi installer.

or open a terminal and use sudo dpkg -i filename.deb
X-tail can be run by selecting
Applications–>accessories–>x-tile