Установим Ubuntu Release Upgrader на старую систему.
Подключитесь к старому экземпляру Ubuntu.
$ ssh example.org -l mgmt
Welcome to Ubuntu 20.04.4 LTS (GNU/Linux 5.4.0 x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage Last login: Wed Apr 27 16:25:14 2022 from 137.11.134.19
Проверим детали операционной системы.
$ lsb_release -a
No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.4 LTS Release: 20.04 Codename: focal
Попробуйте проверить, доступен ли новый выпуск дистрибутива, чтобы определить, что Ubuntu Release Upgrader не установлен.
$ do-release-upgrade --check-dist-upgrade-only --devel-release
-bash: do-release-upgrade: command not found
Установим пакет ubuntu-release-upgrader-core.
$ sudo apt install ubuntu-release-upgrader-core
Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: iso-codes python-apt-common python3-apt python3-distro-info python3-distupgrade python3-update-manager Suggested packages: isoquery python3-apt-dbg python-apt-doc python3-launchpadlib The following NEW packages will be installed: iso-codes python-apt-common python3-apt python3-distro-info python3-distupgrade python3-update-manager ubuntu-release-upgrader-core 0 upgraded, 7 newly installed, 0 to remove and 0 not upgraded. Need to get 3038 kB of archives. After this operation, 22.3 MB of additional disk space will be used. Do you want to continue? [Y/n] y Get:1 http://archive.ubuntu.com/ubuntu focal/main amd64 iso-codes all 4.4-1 [2695 kB] Get:2 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 python-apt-common all 2.0.0ubuntu0.20.04.7 [17.1 kB] Get:3 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 python3-apt amd64 2.0.0ubuntu0.20.04.7 [154 kB] Get:4 http://archive.ubuntu.com/ubuntu focal/main amd64 python3-distro-info all 0.23ubuntu1 [5924 B] Get:5 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 python3-update-manager all 1:20.04.10.10 [38.1 kB] Get:6 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 python3-distupgrade all 1:20.04.38 [104 kB]
Посмотрим имеющиеся релизы.
$ do-release-upgrade --check-dist-upgrade-only --devel-release
Checking for a new Ubuntu release New release '22.04' available. Run 'do-release-upgrade' to upgrade to it.
$ do-release-upgrade --check-dist-upgrade-only
Checking for a new Ubuntu release New release '21.10' available. Run 'do-release-upgrade' to upgrade to it.
Начните обновление релиза.
$ sudo do-release-upgrade --devel-release
Дополнительные примечания
Ubuntu Release Upgrader требует интерфейса Python 3 для D-Bus, который может отсутствовать в данном случае.
ModuleNotFoundError: No module named 'dbus'
Установите пакет python3-dbus и повторите операцию.
$ sudo apt-get install python3-dbus
