[Koha] How to upgrade Koha 19.11 to Koha 20.11? Also upgrade Ubuntu 18.04 to Ubuntu 20.04.

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To upgrade Koha to 20.11, I would recommend to upgrade the operating system too. In my case I have upgraded Ubuntu 18.04 to 20.04 and then upgraded the Koha 19.11 to 20.11.
To upgrade the OS, follow the steps below: 
Step 1: #sudo apt update
Step 2: #sudo apt upgrade
Step 3: #sudo apt dist-upgrade
Step 4: #sudo apt-get autoremove
Step 5: #sudo apt install update-manager-core
Step 6: #sudo do-release-upgrade

Now to upgrade the Koha, follow the steps below: 

Step 1: # sudo apt-get update
Step 2: #sudo apt-get upgrade
Step 3: #echo 'deb http://debian.koha-community.org/koha 20.11 main' | sudo tee /etc/apt/sources.list.d/koha.list
Step 4 : # sudo apt-get update
Step 5: #sudo apt-get install koha-common
Step 6: #sudo apt-get clean
Step 7: #sudo koha-upgrade-schema library (where 'library' is the koha instance name]
Step 8: #sudo koha-rebuild-zebra -v -f library

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