Re: Unable to run psql on 9.5 after broken 12 remove

On 7/3/20 1:54 AM, Moreno Andreo wrote:
> After upgrading python the InvalidUrl is gone, but I still can't run psql
>
> Output of pg_lsclusters, if needed
> root(at)datastore-1:/usr/share/postgresql-common# pg_lsclusters
> Ver Cluster Port Status                Owner     Data
> directory               Log file
> 9.5 main    6543 online                postgres
> /var/lib/postgresql/9.5/main /var/log/postgresql/postgresql-9.5-main.log
> 12  main    5432 down,binaries_missing <unknown>
> /var/lib/postgresql/12/main /var/log/postgresql/postgresql-12-main.log
>
> I followed
> https://askubuntu.com/questions/1223270/psql-command-error-postgresql-version-12-is-not-installed
>
> with no luck, apt-purge simply states that pg12 is not installed.

Looks like the cluster was not removed from the pgcommon setup. This
would explain why you can't run psql. By default pgcommon looks for the
version of psql connected with the most recent version of Postgres it
knows about, in this case 12. Unfortunately that binary no longer
exists. You still have psql. Do:

/usr/lib/postgresql/9.5/bin/psql --help

To avoid having to do that try:

sudo pg_dropcluster 12 main

>
>
> Il 03/07/2020 10:37, Moreno Andreo ha scritto:
>> I have a production server running pg9.5 seamlessly.
>> Yesterday I decided to install libpq to have some crypto functions.
>> Unexpectedly, it installed postgresql 12 and its libpq.
>> I don't need pg 12, so I decided to remove it.
>> It did not went well
>>
>> root(at)datastore-1:/home/user# apt-get --purge remove postgresql-client-12
>> Reading package lists... Done
>> Building dependency tree
>> Reading state information... Done
>> The following package was automatically installed and is no longer
>> required:
>>   libuuid-perl
>> Use 'apt-get autoremove' to remove it.
>> The following packages will be REMOVED:
>>   postgresql-12* postgresql-client-12* postgresql-contrib*
>> 0 upgraded, 0 newly installed, 3 to remove and 89 not upgraded.
>> 1 not fully installed or removed.
>> After this operation, 30.9 MB disk space will be freed.
>> Do you want to continue? [Y/n] y
>> (Reading database ... 32065 files and directories currently installed.)
>> Removing postgresql-contrib (12+215.pgdg80+1) ...
>> Removing postgresql-12 (12.3-1.pgdg80+1) ...
>> update-alternatives: using
>> /usr/share/postgresql/9.5/man/man1/postmaster.1.gz to provide
>> /usr/share/man/man1/postmaster.1.gz (postmaster.1.gz) in auto mode
>> Purging configuration files for postgresql-12 (12.3-1.pgdg80+1) ...
>> Removing postgresql-client-12 (12.3-1.pgdg80+1) ...
>> update-alternatives: using
>> /usr/share/postgresql/9.5/man/man1/psql.1.gz to provide
>> /usr/share/man/man1/psql.1.gz (psql.1.gz) in auto mode
>> Processing triggers for postgresql-common (215.pgdg80+1) ...
>> Building PostgreSQL dictionaries from installed myspell/hunspell
>> packages...
>> Removing obsolete dictionary files:
>> Setting up python3.4 (3.4.2-1+deb8u3) ...
>>   File "/usr/lib/python3.4/http/client.py", line 1014
>>     raise InvalidURL(f"URL can't contain control characters. {url!r} "
>> ^
>> SyntaxError: invalid syntax
>> dpkg: error processing package python3.4 (--configure):
>>  subprocess installed post-installation script returned error exit
>> status 1
>> Errors were encountered while processing:
>>  python3.4
>> E: Sub-process /usr/bin/dpkg returned an error code (1)
>>
>> After this, the package is not anymore on the installed list and I'm
>> not able to issue the psql command:
>>
>> root(at)datastore-1:/home/user# sudo -u postgres psql
>> Error: PostgreSQL version 12 is not installed
>>
>> How can I repair this?
>> Thanks in advance
>> Moreno.
>>
>>
>>
>
>
>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com