Howto guide for upgrading PostgreSQL from version 9.6 to 10.0 on Ubuntu, after its upgrade from version17.10 to 18.04.

TL ; DR ¶

After upgrade to Ubuntu 18.04:

$ sudo pg_dropcluster 10 .0 main --stop $ sudo pg_upgradecluster 9 .6 main $ sudo pg_dropcluster 9 .6 main

Upgrade PostgreSQL¶

During Ubuntu updgrade to 18.04 you receive this message “Configuring postgresql-common”:

Obsolete major version 9.6 The PostgreSQL version 9.6 is obsolete, but the server or client packages are still installed.

Please install the latest packages (postgresql-10 and postgresql-client-10) and upgrade the existing clusters with pg_upgradecluster (see manpage). Please be aware that the installation of postgresql-10 will automatically create a default cluster 10.0/main.

If you want to upgrade the 9.6/main cluster, you need to remove the already existing 10 cluster (pg_dropcluster —stop 10 main, see manpage for details). The old server and client packages are no longer supported.

After the existing clusters are upgraded, the postgresql-9.6 and postgresql-client-9.6 packages should be removed. Please see /usr/share/doc/postgresql-common/README.Debian.gz for details.

Use dpkg -l | grep postgresql to check which versions of postgres are installed:

ii postgresql 10 + 190 all object - relational SQL database ( supported version ) ii postgresql - 10 10.3 - 1 amd64 object - relational SQL database , version 10 server ii postgresql - 9.6 9.6.8 - 0 ubuntu0 .17.10 amd64 object - relational SQL database , version 9.6 server ii postgresql - client 10 + 190 all front - end programs for PostgreSQL ( supported version ) ii postgresql - client - 10 10.3 - 1 amd64 front - end programs for PostgreSQL 10 ii postgresql - client - 9.6 9.6.8 - 0 ubuntu0 .17.10 amd64 front - end programs for PostgreSQL 9.6 ii postgresql - client - common 190 all manager for multiple PostgreSQL client versions ii postgresql - common 190 all PostgreSQL database - cluster manager ii postgresql - contrib 10 + 190 all additional facilities for PostgreSQL ( supported version ) ii postgresql - contrib - 9.6 9.6.8 - 0 ubuntu0 .17.10 amd64 additional facilities for PostgreSQL ii postgresql - plpython3 - 9.6 9.6.8 - 0 ubuntu0 .17.10 amd64 PL / Python 3 procedural language for PostgreSQL 9.6

Run pg_lsclusters , your 9.6 and 10 main clusters should be “online”.

Ver Cluster Port Status Owner Data directory Log file 9.6 main 5432 down postgres / var / lib / postgresql / 9.6 / main pg_log / postgresql -% Y -% m -% d . log 10 main 5433 down postgres / var / lib / postgresql / 10 / main / var / log / postgresql / postgresql - 10 - main . log

There already is a cluster “main” for 10 (since this is created by default on package installation). This is done so that a fresh installation works out of the box without the need to create a cluster first, but of course it clashes when you try to upgrade 9.6/main when 10/main also exists. The recommended procedure is to remove the 10 cluster with pg_dropcluster and then upgrade with pg_upgradecluster .

Stop the 10 cluster and drop it.

$ sudo pg_dropcluster 10 main --stop

Upgrade the 9.6 cluster to the latest version.

$ sudo pg_upgradecluster 9 .6 main

Your 9.6 cluster should now be “down” and you can verifity running pg_lsclusters

Ver Cluster Port Status Owner Data directory Log file 9.6 main 5433 down postgres / var / lib / postgresql / 9.6 / main ... 10 main 5432 online postgres / var / lib / postgresql / 10 / main ...

Check that the upgraded cluster works, then remove the 9.6 cluster.

$ sudo pg_dropcluster 9 .6 main

After all your data check you can remove your old packages.

$ sudo apt purge \ postgresql-9.6 postgresql-client-9.6 postgresql-contrib-9.6

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