dmdotin

First you need to install Malayalam language packs. 

Method 1 - 
          sudo apt-get update
          sudo apt-get install unicode

Method 2 -
          go to 

          System settings -> Language support

dmdotin

Boot your system using windows Recovery / Repair cd

    go to "repair your system"
    use command prompt
    type bootrec /fixboot then hit enter
    type bootrec /fixmbr then hit enter
    exit


Restart to windows 

dmdotin

Updated Dec 18 , 2018 / Version 0.6.3

32 bit

sudo apt install gdebi 

Visit https://github.com/saenzramiro/rambox/releases & get Latest Release 

wget https://github.com/ramboxapp/community-edition/releases/download/0.6.3/Rambox-0.6.3-linux-i386.deb

dmdotin

Open a Terminal and apply following commands

sudo su
apt-get install fonts-smc fonts-samyak-mlym fonts-mlym fonts-lohit-mlym

To get more Malayalam fonts, visit https://smc.org.in/fonts/

dmdotin

64 bit 

If you not installed gdebi , Type below command

:~$ sudo apt install gdebi

Visit https://pencil.evolus.vn/Downloads.html & get Latest Release link

Open Terminal & type 

dmdotin

Open Terminal using ..

Ctrl+Alt+T 

Assume you downloaded ISO file in " Downloads/ISO files " Directory 

Use " cd " command to enter the folders .. Example :

$ cd Downloads/ISO\ files/  & Press Enter ( If your folder names are with space use back slash , space to enter the directory )

dmdotin

Open your applications menu, search for “Disks”, and launch the Disks application.

Seelct the drive containing the Windows system partition, and then select the Windows system partition on that drive. It’ll be an NTFS partition.

Click the gear icon below the partition and select “Edit Mount Options”.

Disable the “Automatic Mount Options” setting at the top of the window. 
In the mount options box, copy-paste or type the following text ..

,remove_hiberfile

dmdotin

Open Terminal Press -  Ctrl+Alt+T 

Enter 

wget -O brave.deb https://laptop-updates.brave.com/latest/dev/ubuntu64

Once finished Enter 

sudo dpkg -i brave.deb

dmdotin

Open Terminal - Ctrl+Alt+T

Enter below command - 

gsettings set com.canonical.Unity.Launcher launcher-position Bottom

if you want to move back to left use command below -

gsettings set com.canonical.Unity.Launcher launcher-position Left

dmdotin

Install Ubuntu for Dual OS ( as normal )

Start Laptop & check if Dual boot select menu appears .. 

If no .. Shut down & Start Again ..

Press " ESC " key to enter boot menu 

Enter Bios Setup F10