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I am running 18.04LTS but I cannot upgrade to 20.04LTS using either the updater or the command line.

1 Answers1

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Classic Upgrading to 20.04 LTS from 18.04 LTS will be available in July.

However, according to this page, you can upgrade to the 20.04 with

sudo apt update
sudo do-release-upgrade -d

Although you specify the -d (development) argument, it will upgrade to the 20.04 stable version. It's just because the classic way to upgrade will wait the 20.04.1 version, in July (Because LTS version is for people who wants really stable system).

Make sure to have a clean upgrade before

sudo apt update && sudo apt dist-upgrade
sudo apt autoremove
sudo apt clean
reboot