Upgrade Ubuntu 18.04 to 20.04 LTS using command line

Originally published at: https://www.cyberciti.biz/faq/upgrade-ubuntu-18-04-to-20-04-lts-using-command-line/

I need to upgrade the Ubuntu Linux version 18.04 LTS server to a 20.04 LTS server using the command line option. How do I upgrade Ubuntu 18.04 to 20.04?

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Thanks for this wonderful guide, I am having a problem with my 20.04 LTS server, the system boots and runs normal for around 30 to 40 min and then it shut down by itself. I have checked all the hardware and there seems to be no problem. I am at a loss now, any advice would be awesome!!

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