HPR4492: How to do a distribution upgrade of an Ubuntu LTS on a Digital Ocean droplet

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Digital Ocean maintains its own version of the Ubuntu core packages which are hosted in

it's own repositories. To upgrade from one LTS to the next the do-release-upgrade program

must know to use third party repositories during the upgrade process.

RELEASE_UPGRADER_ALLOW_THIRD_PARTY=1 do-release-upgrade

Moving data from a previous version of Postgres to the latest. In this case, the

obsolete Postgres v12 to the default Postgres v14 on Ubuntu 22.04 LTS.

 pg_dropcluster --stop 14 main pg_upgradecluster -v 14 12 main

Fixing NextCloud after the upgrade.

The version of PHP upgraded from v7.4 to v8.1. The old versions of the Apache2 PHP modules must be disabled and the new versions enabled.

a2dismod php7.4 a2enmod php8.1 apt install php8.1-pgsql apt install php8.1-gd

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