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I need to upgrade ubuntu 16.04 to 20.04. When I use graphic interface, a pop-up windows tells me that all is updated and Ubuntu tells me that 18.04 must be installed first that it is normal.

But when I click nothing happens.

When I use the command line : sudo do-release-upgrade I have the message :

Please install all available updates for your release before upgrading.

I don't understand. Anyone has an idea ?

Sorry for my bad english

Eugenie
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  • 16.04 is no longer supported. You should reinstall. – FedKad Aug 29 '21 at 13:48
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    You need to ensure your xenial or 16.04 system is fully-upgraded before you can release-upgrade. The error message is telling you that you haven't applied all 16.04 upgrades. I'd suggest sudo apt update & read the messages, ensure there are no errors (or lines are missing), then sudo apt full-upgrade and providing all upgrades are applied (and no sources are missing from the apt update you ran earlier), you may need to reboot, then the do-release-upgrade should work. – guiverc Aug 29 '21 at 13:56
  • @guiverc How the OP will be able to do apt update, since 16.04 is not supported? – FedKad Aug 29 '21 at 14:04
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    Because of ESM the repositories are still available (some mirrors may not be, but the main archive is at least as are many mirrors). @FedonKadifeli – guiverc Aug 29 '21 at 14:06
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    Upgrading Ubuntu 16.04 or older to a currently supported version of Ubuntu such as 20.04 *is on topic on Ask Ubuntu. see the help page: https://askubuntu.com/help/on-topic – C.S.Cameron Aug 30 '21 at 02:05

3 Answers3

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Thanks you very much.

Yes, in fact, I had errors during sudo apt update. So I remove some deposits (skype and others). Now it's ok. I can upgrade 16.04 to 18.04.

Eugenie
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    Please, add extra information to your "answer" after you do the upgrade to 18.04, and then, after you upgrade to 20.04. – FedKad Aug 29 '21 at 15:06
  • If you plan to end up at 20.04, upgrading to 18.04 then immediately upgrading to 20.04 is a bad idea. You are better off cleanly installing 20.04 – Nmath Aug 29 '21 at 17:36
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    Don't forget to reboot in 18.04 at least, (I would also check out the system there before your next upgrade) then perform your next do-release-upgrade – guiverc Aug 30 '21 at 02:42
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use sudo apt update && sudo apt upgrade && sudo apt full-upgrade and then upgrade to 18.04 and then to 20.04

Kushagra Srivastava
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You need to ensure your xenial or 16.04 system is fully-upgraded before you can release-upgrade.

The error message is telling you that you haven't applied all 16.04 upgrades.

I'd suggest

sudo apt update

and read the messages, ensure there are no errors (or lines are missing), then

sudo apt full-upgrade

and providing all upgrades are applied (and no sources are missing from the apt update you ran earlier), you may need to reboot, then the do-release-upgrade should work.

guiverc
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