Install PostgreSQL 11 Elementary OS
Hello Elementary OS User! Install PostgreSQL 11 on Elementary OS GNU/Linux – Step by step Tutorial.
And PostgreSQL 11 Elementary OS Install is a Major Release that contains several substantial Changes and Improvements.
Moreover, PostgreSQL 11 contains a number of Extensive Changes that May affect Compatibility with Previous Releases.
Especially relevant: A dump/restore using pg_dumpall, or use of pg_upgrade, is Required for those wishing to Migrate Data from any previous release.
 
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Open a Terminal Shell emulator window 
 (Press “Enter” to Execute Commands)  In case first see: Terminal QuickStart Guide. 
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How to Add PostgreSQL 11 Elementary OS Apt Repository 
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Installing PostgreSQL for Elementary OS. sudo apt install postgresql-11 If Got “User is Not in Sudoers file” then see: How to Enable sudo 
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How to Getting Started with PostgreSQL 11 Admin 
