Somehow I've managed to completely bugger the install of postgresql on Ubuntu karmic. I want to start over from scratch, but when I "purge" the package with apt-get it still leaves traces behind such that the reinstall configuration doesn't run properly.

After I've done:

apt-get purge postgresql apt-get install postgresql 

It said

Setting up postgresql-8.4 (8.4.3-0ubuntu9.10.1) ... Configuring already existing cluster (configuration: /etc/postgresql/8.4/main, data: /var/lib/postgresql/8.4/main, owner: 108:112) Error: move_conffile: required configuration file /var/lib/postgresql/8.4/main/postgresql.conf does not exist Error: could not create default cluster. Please create it manually with pg_createcluster 8.4 main --start or a similar command (see 'man pg_createcluster'). update-alternatives: using /usr/share/postgresql/8.4/man/man1/postmaster.1.gz to provide /usr/share/man/man1/postmaster.1.gz (postmaster.1.gz) in auto mode. Setting up postgresql (8.4.3-0ubuntu9.10.1) ... 

I have a "/etc/postgresql" with nothing in it and "/etc/postgresql-common/" has a 'pg_upgradecluser.d' directory and root.crt and user_clusters files.

The /etc/passwd has a postgres user; the purge script doesn't appear to touch it. There's been a bunch of symptoms which I work through only to expose the next.

Right this second, when I run that command "pg_createcluster..." it complains that '/var/lib/postgresql/8.4/main/postgresql.conf does not exist', so I'll go find one of those but I'm sure that won't be the end of it.

Is there not some easy one-liner (or two) which will burn it completely and let me start over?

9 Answers

Option A

If your install isn't already damaged, you can drop unwanted PostgreSQL servers ("clusters") using pg_dropcluster. Use that in preference to a full purge and reinstall if you just want to restart with a fresh PostgreSQL instance.

$ pg_lsclusters Ver Cluster Port Status Owner Data directory Log file 11 main 5432 online postgres /var/lib/postgresql/11/main /var/log/postgresql/postgresql-11-main.log $ sudo systemctl stop postgresql@11-main $ sudo pg_dropcluster --stop 11 main $ sudo pg_createcluster --start 11 main 

Option B

If you really need to do a full purge and reinstall, first make sure PostgreSQL isn't running. ps -C postgres should show no results.

Now run:

apt-get --purge remove postgresql\* 

to remove everything PostgreSQL from your system. Just purging the postgres package isn't enough since it's just an empty meta-package.

Once all PostgreSQL packages have been removed, run:

rm -r /etc/postgresql/ rm -r /etc/postgresql-common/ rm -r /var/lib/postgresql/ userdel -r postgres groupdel postgres 

You should now be able to:

apt-get install postgresql 

or for a complete install:

apt-get install postgresql-8.4 postgresql-contrib-8.4 postgresql-doc-8.4 

I had a similar situation: I needed to purge postgresql 9.1 on a debian wheezy ( I had previously migrated from 8.4 and I was getting errors ).

What I did:

First, I deleted config and database

$ sudo pg_dropcluster --stop 9.1 main 

Then removed postgresql

$ sudo apt-get remove --purge postgresql postgresql-9.1 

and then reinstalled

$ sudo apt-get install postgresql postgresql-9.1 

In my case I noticed /etc/postgresql/9.1 was empty, and running service postgresql start returned nothing

So, after more googling I got to this command:

$ sudo pg_createcluster 9.1 main 

With that I could start the server, but now I was getting log-related errors. After more searching, I ended up changing permissions to the /var/log/postgresql directory

$ sudo chown root.postgres /var/log/postgresql $ sudo chmod g+wx /var/log/postgresql 

That fixed the issue, Hope this helps

Steps that worked for me on Ubuntu 8.04.2 to remove postgres 8.3

1. List All Postgres related packages

   dpkg -l | grep postgres ii postgresql 8.3.17-0ubuntu0.8.04.1 object-relational SQL database (latest versi ii postgresql-8.3 8.3.9-0ubuntu8.04 object-relational SQL database, version 8.3 ii postgresql-client 8.3.9-0ubuntu8.04 front-end programs for PostgreSQL (latest ve ii postgresql-client-8.3 8.3.9-0ubuntu8.04 front-end programs for PostgreSQL 8.3 ii postgresql-client-common 87ubuntu2 manager for multiple PostgreSQL client versi ii postgresql-common 87ubuntu2 PostgreSQL database-cluster manager ii postgresql-contrib 8.3.9-0ubuntu8.04 additional facilities for PostgreSQL (latest ii postgresql-contrib-8.3 8.3.9-0ubuntu8.04 additional facilities for PostgreSQL 

2. Remove all above listed

   sudo apt-get --purge remove postgresql postgresql-8.3 postgresql-client postgresql-client-8.3 postgresql-client-common postgresql-common postgresql-contrib postgresql-contrib-8.3 

3. Remove the following folders

   sudo rm -rf /var/lib/postgresql/ sudo rm -rf /var/log/postgresql/ sudo rm -rf /etc/postgresql/ 

apt-get purge postgresql* 

is enough.

I know an answer has already been provided, but dselect didn't work for me. Here is what worked to find the packages to remove:

# search postgr | grep ^i i postgresql - object-relational SQL database (supported i A postgresql-8.4 - object-relational SQL database, version 8. i A postgresql-client-8.4 - front-end programs for PostgreSQL 8.4 i A postgresql-client-common - manager for multiple PostgreSQL client ver i A postgresql-common - PostgreSQL database-cluster manager # aptitude purge postgresql-8.4 postgresql-client-8.4 postgresql-client-common postgresql-common postgresql rm -r /etc/postgresql/ rm -r /etc/postgresql-common/ rm -r /var/lib/postgresql/ 

Finally, editing /etc/passwd and /etc/group

Following ae the steps i followed to uninstall and reinstall. Which worked for me.

First remove the installed postgres :-

sudo apt-get purge postgr*

sudo apt-get autoremove

Then install 'synaptic':

sudo apt-get install synaptic

sudo apt-get update

Then install postgres

sudo apt-get install postgresql postgresql-contrib

I just ran into the same issue for Ubuntu 13.04. These commands removed Postgres 9.1:

sudo apt-get purge postgresql sudo apt-get autoremove postgresql 

It occurs to me that perhaps only the second command is necessary, but from there I was able to install Postgres 9.2 (sudo apt-get install postgresql-9.2).

I was following the replies, When editing /etc/group I also deleted this line:

ssl-cert:x:112:postgres 

then, when trying to install postgresql, I got this error

Preconfiguring packages ... dpkg: unrecoverable fatal error, aborting: syntax error: unknown group 'ssl-cert' in statoverride file E: Sub-process /usr/bin/dpkg returned an error code (2) 

Putting the "ssl-cert:x:112:postgres" line back in /etc/group seems to fix it (so I was able to install postgresql)

I was facing same problem in my ubuntu 16.04

but i fixed that problem and it's very simple just follow these step and you will be able to install postgresql 10 in your system :

Add this to your sources.list:

sudo vim /etc/apt/sources.list deb wheezy main non-free contrib deb-src wheezy main non-free contrib 

after that add these link to your pgdg.list file if it's not there you have to create && add link && save it.

sudo vim /etc/apt/sources.list.d/pgdg.list deb xenial-pgdg main deb precise-pgdg main 

then update your system

sudo apt-get update sudo apt-get upgrade 

and install that unmet dependencies :

apt-get install ssl-cert 

that's it. now Install postgresql using these command

sudo apt-get install postgresql-10