Installing phpPgAdmin 5.1 on Ubuntu 16.04 with PostgreSQL 10 not supported

Actually you still can modify this file manually:

classes/database/Connection.php

// Detect version and choose appropriate database driver
switch (substr($version,0,3)) {
    case '9.5': return 'Postgres'; break;
    case '9.4': return 'Postgres94'; break;
    case '9.3': return 'Postgres93'; break;
    case '9.2': return 'Postgres92'; break;
    case '9.1': return 'Postgres91'; break;
    case '9.0': return 'Postgres90'; break;
    case '8.4': return 'Postgres84'; break;
    case '8.3': return 'Postgres83'; break;
    case '8.2': return 'Postgres82'; break;
    case '8.1': return 'Postgres81'; break;
    case '8.0':
    case '7.5': return 'Postgres80'; break;
    case '7.4': return 'Postgres74'; break;
}

switch (substr($version,0,4)) {
    case '10.1': return 'Postgres'; break;
}

Not fully tested, but all the main functions work fine.

Or create your own fork of https://github.com/phppgadmin/phppgadmin and create/fix a couple of files for implementing full support.

EDIT 3: phpPgAdmin is in active development again! If you download the latest version, it supports PostgreSQL up to v11.x

http://phppgadmin.sourceforge.net/doku.php?id=download https://github.com/phppgadmin/phppgadmin

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phpPgAdmin hasn't been actively developed for years. It's still a great interface for PostgreSQL, but unfortunately they only officially support up to 9.2. I've noticed that the latest version still works up to 9.6 though, at least it has in a production environment for the past 6 months, and before that worked with whatever I had (9.4 / 9.5?) for years.

I would suggest installing 9.6 instead, and going from there.

EDIT: If you're dead keen on using v10, then you can still use pgAdmin 4 as the interface, though this is not web based.

Reference: Official phpPgAdmin Website

EDIT2: See the answer by DToch for a good workaround

To be clearer, the full path is /usr/share/phppgadmin/classes/database/Connection.php

Also you can simply add

default: return 'Postgres'; break; 

at the end of the switch statement.

Also needed is the username for logging in should be "postgres". Not well documented.