How to enable hibernation in Ubuntu 12.04 lts [Solved]

After upgrading to Precice Pangolin - Ubuntu 12.04 lts, I was unable to hibernate my machine by default. I googled it and found a solution(It worked for me.)

To check whether hibernate is supported, Open a terminal and type:

pm -hibernate

after entering this, your system will attempt a hibernate.

to enable hibernation, open a terminal and type the following line and press enter.

sudo gedit /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla

insert the following content

[Re-enable hibernate by default]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes

save and exit.

restart the system once and hibernation will be enabled. 

How to Upgrade ubuntu 11.04/10.04 to Ubuntu 12.04 easy guide

Hi all, Many of the users follow the custom of installing a fresh copy of ubuntu 12.04 by erasing the previous installation. If you want to keep your files and compatible installations from your previous installation still here in your new installation, you must go for an upgrade instead of a new installation.

99 percentage of upgrades leads to success, but if you have ultimate important information., please back up before starting the process. this guide is for the ones who like to choose the upgrade from USB option.

You have to download an ISO image from ubuntu's  download page. and then go to your previous installation, choose administration->create a startup disk.

This will show a window where you can select the image and the target usb disk.

Then, proceed with the steps and the system will prompt you to enter password for some two three times.

The process of creating a startup disk  may take a few minutes to complete. after the startup disk creation finished, restart your system with boot from usb enabled.

After some time the machine will boot from the startup disk, and will show a live session of ubuntu running in you machine.

Bowse through the menu's and check whether everything is working fine.

There will be an icon Install ubuntu in your live session's desktop you can trigger the installation process by double clicking it.

After few steps it will show the below screen.

Do not forget to select the upgrade option

 Choose the upgrade option as shown in the picture and proceed with the installation. it is preferred to connect to the Internet as well as power source to make the installation smooth. if you are connected to the Internet, Some additional plug-ins and drivers may be downloaded. bu this will make the installation bit time consuming because the Os may download some updates if there is a working net connection.

Ubuntu 12.04 review video

Here is the link for a popular video review of ubuntu 12.04 precise pangoline

http://www.google.co.in/url?sa=t&source=web&cd=8&ved=0CG8QtwIwBw&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3Dh4tBDam3ttI&ei=3LmmT-CyFIW8rAelxJXiAQ&usg=AFQjCNHqL8fQmdSDr3MAyE5wr7f3p9-zeQ&sig2=L672wLrmcPUAlYUj74LKIw