Postgres upgrade says warning unknown distribution NEON

[Eddie Dunckley]

Setting up postgresql-common (190ubuntu0.1) ...
supported-versions: WARNING! Unknown distribution: neon

urgh, though Linux KDE NEON is a well known distribution.

[Christian Ehrhardt  (paelzer)]

Hi Eddie,
190ubuntu0.1 suggests that you are on Ubuntu bionic or something derived from that.

The package needs to know where it runs, and it does so via /etc/os-release

    # we have /etc/os-release, use it
    if [ -r /etc/os-release ]; then
        . /etc/os-release
        DISTRO="${ID:-unknown}"
        RELEASE="${VERSION_ID:-unstable}" # unstable doesn't have this field

Based on that in /usr/share/postgresql-common/supported-versions there is a mapping which default now applies.
That could for example be
DISTRO=Ubuntu
RELEASE=18.04

Which would map to postgresql 10.

In your case that isn't true. You are not running Ubuntu but a derivative.
If that decides to change these values then packages might stumble over that.
There is nothing to fix here, it is part of KDE-Neon as a downstream to maintain a Delta for this just as Ubuntu does to Debian and Debian does to upstream.

[Eddie Dunckley (eddie-dunckley)]

Thank you Christian for clarifying.