Bug#866221: postgresql-9.4-postgis-2.1 uninstallable under Stretch

[Markus Wanner]

Hello Élie,

On 06/28/2017 03:28 PM, Élie Bouttier wrote:
> I upgraded from Jessie with postgresql-9.4 to Stretch which brings postgresql-9.6.
> The postgresql-9.4 package from Jessie is still installable under Stretch in order to run the pg_upgradecluster utility.
> However, my cluster is half-broken, the postgresql-9.4-postgis-2.1 having been uninstalled (and postgresql-9.6-postgis-2.3 installed).

that's what the pgapt [0] repository is for. Please try installing
postgresql-9.4-postgis-2.1 (for stretch) from there.

> I suppose the postgresql-9.4-postgis-2.1 package should be installable under Stretch (like postgresql-9.4) to allow an cluster update.

No, postgresql-9.4-postgis-2.1 from jessie is expected to be compiled
and work for jessie, not stretch.

The problem basically is that Debian only ever supports a single
Postgres (major) version, where as you need to have multiple installed
in parallel for upgrades (with reasonably short downtimes).

Please let us know if pgapt is a feasible solution for you and whether
or not the upgrade worked with the postgis package from there.

Kind Regards

Markus Wanner


[0]: PgApt
https://wiki.postgresql.org/wiki/Apt

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