Bug#986975: libgdal28: please add Breaks: libgdal20

[Sebastiaan Couwenberg]

On 5/19/21 6:21 PM, Dennis Filder wrote:
> Do you remember why you added that Breaks:? 

Because files in gdal-data (>= 2.5.0~) cannot be used by libgdal20 (<<
2.5.0~). GDAL 2.5.0~beta1 introduced PROJ 6 support, which changed the
content of proj-data significantly, making it incompatible with prior
versions.

This issue affected Ubuntu bionic where the newer GDAL is available via
the UbuntuGIS PPA.

> And if it was due to
> upstream changes does that mean that postgis-enabled clusters are
> essentially unmigratable unless you dump them in full before starting
> the upgrade?  Because if so, this should be mentioned in the Bullseye
> release notes.

PostGIS databases have never been able to be migrated during a
distribution upgrade. You've always needed to recreate the databases in
the new cluster.

With the PostGIS library no longer including the minor version in its
filename since 3.0, it might be possible to migrate PostGIS databases
with pg_upgradecluster from bullseye to bookworm if PostGIS 3.x will be
in bookworm too.

Kind Regards,

Bas

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