Howto guide for upgrading PostgreSQL from version 10 to 11 on Ubuntu, after its upgrade from version 18.10 to 19.04.

TL ; DR ¶

After upgrade to Ubuntu 19.04:

$ sudo pg_dropcluster 11 main --stop $ sudo pg_upgradecluster 10 main $ sudo pg_dropcluster 10 main

Upgrade PostgreSQL¶

During Ubuntu updgrade to 19.04 you receive this message “Configuring postgresql-common”:

Obsolete major version 10 The PostgreSQL version 10 is obsolete, but the server or client packages are still installed.

Please install the latest packages (postgresql-11 and postgresql-client-11) and upgrade the existing clusters with pg_upgradecluster (see manpage). Please be aware that the installation of postgresql-11 will automatically create a default cluster 11/main.

If you want to upgrade the 10/main cluster, you need to remove the already existing 11 cluster (pg_dropcluster —stop 11 main, see manpage for details). The old server and client packages are no longer supported.

After the existing clusters are upgraded, the postgresql-10 and postgresql-client-10 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 11 + 199 all object - relational SQL database ( supported version ) ii postgresql - 10 10.8 - 0 ubuntu0 .18.10.1 amd64 object - relational SQL database , version 10 server ii postgresql - 11 11.3 - 0 ubuntu0 .19.04.1 amd64 object - relational SQL database , version 11 server ii postgresql - client 11 + 199 all front - end programs for PostgreSQL ( supported version ) ii postgresql - client - 10 10.8 - 0 ubuntu0 .18.10.1 amd64 front - end programs for PostgreSQL 10 ii postgresql - client - 11 11.3 - 0 ubuntu0 .19.04.1 amd64 front - end programs for PostgreSQL 11 ii postgresql - client - common 199 all manager for multiple PostgreSQL client versions ii postgresql - common 199 all PostgreSQL database - cluster manager

Run pg_lsclusters , your 10 and 11 main clusters should be “online”.

Ver Cluster Port Status Owner Data directory Log file 10 main 5432 online postgres / var / lib / postgresql / 10 / main / var / log / postgresql / postgresql - 10 - main . log 11 main 5433 online postgres / var / lib / postgresql / 11 / main / var / log / postgresql / postgresql - 11 - main . log

There already is a cluster “main” for 11 (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 10/main when 11/main also exists. The recommended procedure is to remove the 11 cluster with pg_dropcluster and then upgrade with pg_upgradecluster .

Stop the 11 cluster and drop it.

$ sudo pg_dropcluster 11 main --stop

Upgrade the 10 cluster to the latest version.

$ sudo pg_upgradecluster 10 main

Your 10 cluster should now be “down” and you can verifity running pg_lsclusters

Ver Cluster Port Status Owner Data directory Log file 10 main 5433 down postgres / var / lib / postgresql / 10 / main / var / log / postgresql / postgresql - 10 - main . log 11 main 5432 online postgres / var / lib / postgresql / 11 / main / var / log / postgresql / postgresql - 11 - main . log

Check that the upgraded cluster works, then remove the 10 cluster.

$ sudo pg_dropcluster 10 main

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

$ sudo apt-get purge postgresql-10 postgresql-client-10

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