Unable to configure PostgreSQL in Plesk Onyx on Ubuntu 18.04: The test connection to the database server has failed

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    OHOUO YVES DANIEL

    i got the same error for UBUNTU 16.04 LTS

    i can't add and connect to postgresql server with admin user.

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    Alexandr Shadrin

    Hello @OHOUO YVES DANIEL!

    As I can see from the screenshot, PostgreSQL 10.4 is installed on the server. I have updated the article with a little bit more details regarding this issue.

    In short, the error is actual for PostgreSQL 10 on any OS, Ubuntu 18.04 just has it out-of-the-box.

    I suggest removing PostgreSQL 10 from the server via Plesk installer and with the help of `apt purge postgresql*` command. Then, disable custom repositories and install PostgreSQL 9 that comes for Ubuntu 16.04 out of the box.

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