Re: pg_ctl pointing postgres 9.5.4 after installation of postgres 10

What I suspect has happened is that:

- you have 10.4 installed

- you have 9.5 *client only* (as a result of upgrade or manual removal
of the server package)

Examine /usr/lib/postgresql/, you will probably see a 9.5 and 10
directory (but the 9.5 one probably won't have a postgres binary).

If you set PATH to have /usr/lib/postgresql/10/bin in front of
everything else then you will get you 10.4 binaries. However this is a
bit of a pain - I think you can make life simpler by using
'update-alternatives' to make postgres version 10 the default instead of
9.5 - or remove all the 9.5 packages (*but* if removing be careful that
you really don't have any 9.5 databases under /var/lib/postgresql/9.5
first...otherwise you will be reaching for your backups - at this point
I should ask you do have backups right)?

So perhaps do a bit more investigation, and report back here before
removing anything :-)

regards

Mark

On 12/08/18 07:26, Debraj Manna wrote:
> The same question I have asked in stackoverflow and dba.stackexchange,
> I did not get any reply there also.
>
> 1. https://dba.stackexchange.com/questions/214671/pg-ctl-still-pointing-to-9-5-4-after-upgrade-to-postgres-10
> 2. https://stackoverflow.com/questions/51802990/pg-ctl-still-pointing-to-9-5-4-after-upgrade-to-postgres-10-in-ubuntu-14
>
>
> On Sun, Aug 12, 2018 at 12:32 AM, Debraj Manna
> <subharaj(dot)manna(at)gmail(dot)com <mailto:subharaj(dot)manna(at)gmail(dot)com>> wrote:
>
> Hi
>
> I have updated postgres from 9.5.4 to the latest 10.4.
>
> But after installation I am seeing
>
> support(at)platform1:/usr/bin$ ls -lah pg_ctl
> lrwxrwxrwx 1 root root 34 Jun 13 08:59 pg_ctl ->
> /usr/lib/postgresql/9.5/bin/pg_ctl
>
> The issue appears similiar to the one discussed here
> https://stackoverflow.com/a/24763074/785523
> <https://stackoverflow.com/a/24763074/785523>.
>
> To install postgres 10 I have followed the below steps:-
>
> |sudo add-apt-repository "deb
> http://apt.postgresql.org/pub/repos/apt/
> <http://apt.postgresql.org/pub/repos/apt/> trusty-pgdg main"|
>
> |wget --quiet -O -
> https://www.postgresql.org/media/keys/ACCC4CF8.asc
> <https://www.postgresql.org/media/keys/ACCC4CF8.asc> | sudo
> apt-key add -|
>
> |sudo apt-get update|
>
> |sudo apt-get install postgresql-10|
>
> Then performed the data migration using pg_upgrade and then
> removed postgres 9.5
>
> Now posgres -V is also failing with the below error
>
> support(at)platform1:/usr/bin$ postgres -V
> The program 'postgres' is currently not installed. You can install
> it by typing:
> sudo apt-get install postgres-xc
>
> Can someone let me know what is wrong and how can I fix it?
>
>