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Major Version Upgrade on Debian

  • make a snapshot/backup of the machine
  • check the running clusters using pg_lsclusters command
  • drop the new cluster (the one running the target version) sudo -u postgres pg_dropcluster --stop 15 main
  • (optional) if you are ssh-ing from a macOS/Item2 the LC_CTYPE is wrongly set
    • run export LC_CTYPE=en_US.UTF-8 export LC_ALL=en_US.UTF-8
  • upgrade the old cluster sudo -u postgres pg_upgradecluster 13 main
  • check the running clusters using pg_lsclusters command
  • drop the old cluster (be sure the upgrade was successful) sudo -u postgres pg_dropcluster 13 main
  • uninstall old postgresql packages
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