This is fixed/changed in the new server guide. The Upgrade part is at https://discourse.ubuntu.com/t/upgrade-introduction/11576
And the installation is at https://discourse.ubuntu.com/t/installation/11320
That being said, the "apt dist-upgrade" command does exist in xenial onwards, including bionic. Where have you seen that it doesn't work?
This is fixed/changed in the new server guide. The Upgrade part is at https:/ /discourse. ubuntu. com/t/upgrade- introduction/ 11576
And the installation is at https:/ /discourse. ubuntu. com/t/installat ion/11320
That being said, the "apt dist-upgrade" command does exist in xenial onwards, including bionic. Where have you seen that it doesn't work?