I have recently installed lubuntu and want some software to make it run smoothly.Also, after i installed lubuntu, i saw no grub image (it seems bad without image) So, Please tell me how to set grub image
First update your system , so that It will let you install updates.
sudo apt-get update sudo apt-get upgrade sudo apt-get dist-upgrade
To play MP3 songs you might need some codecs , so
sudo apt-get install lubuntu-restricted-extras
Open Ubuntu Software Center and Look for VLC Media Player.
For Having better Battery you can use tlp.
sudo add-apt-repository ppa:linrunner/tlp sudo apt-get update sudo apt-get install tlp
To change GRUB background , you can use Grub Customizer
sudo add-apt-repository ppa:danielrichter2007/grub-customizer sudo apt-get update sudo apt-get install grub-customizer
To complete rajagenupula answer, you can find a complete post about it on forumubuntu. Here is the link : http://ubuntuforums.org/showthread.php?t=1880394