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Updating Ubuntu 16.04 to 20.04

Posted November 10, 2020 145 views
UbuntuUbuntu 16.04Ubuntu 18.04Ubuntu 20.04

Is there, anywhere on the internet, a reliable step-by-step guide on how to upgrade from Ubuntu 16.04 to 20.04? Apparently it has to be done via 18.04. I have updated the current 16.04 system by:

  • sudo ufw allow 1022/tcp

  • sudo apt update && sudo apt upgrade

After this i get the message:
The following packages have been kept back:
cloud-init

I guess that is why the system upgrade fails:

  • sudo do-release-upgrade

gives the message:
Please install all available updates for your release before upgrading.

Thanks for any help!
David

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DavidKo
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DavidKo

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2 answers
DavidKo November 10, 2020

Edit: I don’t find any useful information that explains if upgrading via 18.04 means:

  • the upgrade process will do this by itself in two steps
  • I need to specify 18.04 in the command since otherwise it will try to go straight to 20.04
  • I need to do the upgrade twice; first the upgrade command will upgrade to 18.04. Then I will have to run the upgrade again and it will install 20.04

//David

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Yannek November 19, 2020

Hi,

@DavidKo wrote
 I don’t find any useful information that explains if upgrading via 18.04 means...

You need to do an upgrade in two steps

  • from 16.04 to 18.04
  • from 18.04 to 20.04

Each time you do that with a command

sudo do-release-upgrade

@DavidKo wrote
After this i get the message:
The following packages have been kept back:
cloud-init

I guess that is why the system upgrade fails

That is probably the cause of the failure. You could try to do some steps to fix it but before doing anything I recommend making a snapshot of the droplet.
You could try to (re)install the package that has been kept back.

sudo apt install cloud-init

You may get the questions about replacing packages with the new ones during the installation. Agree to that.

Let me know if it works, pls.

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