Ubuntu Upgrade from Ubuntu 16 LTS to Ubuntu 18 LTS

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do-release-upgrade not found

apt install ubuntu-release-upgrader-core

Before upgrade

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.6 LTS
Release:        16.04
Codename:       xenial

Upgrade

Move the system up-to-date

apt update
apt upgrade
apt autoremove

Do the upgrade from console.

do-release-upgrade

If command not found

apt install ubuntu-release-upgrader-core

After upgrade

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.3 LTS
Release:        18.04
Codename:       bionic

References

Daniel Simao 23:02, 13 August 2019 (EDT)