How to Upgrade Koha

Open terminal (Ctrl + Alt + t)

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install koha-common

wget -O- http://debian.koha-community.org/koha/gpg.asc | sudo apt-key add -

sudo apt-get clean 

Upgrade Database Schema

Database schema of old Koha should upgrade to new one. Apply following commands in a terminal,

sudo koha-upgrade-schema library

Rebuild the Zebra Index.

Apply following command in a terminal,

sudo koha-rebuild-zebra -v -f library