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Ubuntu upgrade from 18.04 lts to 20.04 lts

The latest version of Ubuntu is 20.04.lts and is named as “Focal Fossa”. 

To start with the upgrade the first and foremost thing is to backup 

the server . The rest procedure is as follows:



The current os version can be recorded from /etc/os-release file.















Once done with backup we need to update all packages of ubuntu 18.04 

to latest by running the command


sudo apt update










After successful update just upgrade all the installed packages to

latest using the command


sudo apt upgrade













Now remove all unused old kernels as they wont be used any further

removing them might help us clear some space on the disk.


sudo apt --purge autoremove










Install update-manager-core package if not already installed.












Now upgrade the system to latest lts.


sudo do-release-upgrade









If you come across an output like this :


Checking for a new Ubuntu release

There is no development version of an LTS available.

To upgrade to the latest non-LTS development release 

set Prompt=normal in /etc/update-manager/release-upgrades.



Use the following command to upgrade the system forcefully 

using -d option with the command used above.


sudo do-release-upgrade -d 

























































Once upgrade is complete reboot the system .


After reboot we you can check the /etc/os-release file to confirm 

the updated version.














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