dmdotin

sudo add-apt-repository ppa:kirillshkrogalev/ffmpeg-next
sudo apt-get install ffmpeg
sudo add-apt-repository ppa:obsproject/obs-studio
sudo apt-get update
sudo apt-get install obs-studio

dmdotin

sudo apt-get update
sudo apt-get install ibus-m17n

Then logout & Login Again.

1) Click on Language Icon on Top Bar in Ubuntu Desktop. / All Settings >> Text Entry .
2) Click - Text Entry Setting >> Below Input Source to use >> Click + Icon 
3) Type Malayalam in search Box & Click on - Malayalam Swanalekha (M17n) 
4) Click Add Button.

dmdotin

grub rescue> ls [Enter]

Then try first option / if not works and make error use next one ..

grub rescue> ls (hd0,msdos7) [Enter]
(hd0,msdos7) : Filesystem is unknown .

grub rescue> ls (hd0,msdos6) [Enter]
(hd0,msdos6): Filesystem is ext2.

dmdotin

Go to - https://www.microsoft.com/software-download/windows10

on Windows 

Click On *Download Tool Now*

Run it 

Accept 

dmdotin

Login in to Win10

Run CMD as Administrator 

bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi

Add above line & ENTER 

Restart