Unable to run psql on 9.5 after broken 12 remove

After upgrading python the InvalidUrl is gone, but I still can't run psql

Output of pg_lsclusters, if needed
root@datastore-1:/usr/share/postgresql-common# pg_lsclusters
Ver Cluster Port Statusￜￜￜￜￜￜￜￜￜￜￜￜￜￜￜ Ownerￜￜￜￜ Data
directoryￜￜￜￜￜￜￜￜￜￜￜￜￜￜ Log file
9.5 mainￜￜￜ 6543 onlineￜￜￜￜￜￜￜￜￜￜￜￜￜￜￜ postgres
/var/lib/postgresql/9.5/main /var/log/postgresql/postgresql-9.5-main.log
12ￜ mainￜￜￜ 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.

Il 03/07/2020 10:37, Moreno Andreo ha scritto:

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@datastore-1:/usr/share/postgresql-common# pg_lsclusters
Ver Cluster Port Statusￜￜￜￜￜￜￜￜￜￜￜￜￜￜￜ Ownerￜￜￜￜ Data
directoryￜￜￜￜￜￜￜￜￜￜￜￜￜￜ Log file
9.5 mainￜￜￜ 6543 onlineￜￜￜￜￜￜￜￜￜￜￜￜￜￜￜ postgres
/var/lib/postgresql/9.5/main /var/log/postgresql/postgresql-9.5-main.log
12ￜ mainￜￜￜ 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@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:
ￜ libuuid-perl
Use 'apt-get autoremove' to remove it.
The following packages will be REMOVED:
ￜ 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) ...
ￜ File "/usr/lib/python3.4/http/client.py", line 1014
ￜￜￜ raise InvalidURL(f"URL can't contain control characters. {url!r} "
^
SyntaxError: invalid syntax
dpkg: error processing package python3.4 (--configure):
ï¿œsubprocess installed post-installation script returned error exit
status 1
Errors were encountered while processing:
ï¿œpython3.4
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@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.klaver@aklaver.com

Il 03/07/2020 16:51, Adrian Klaver ha scritto:

On 7/3/20 1:54 AM, Moreno Andreo wrote:

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

OK, it confirms that 9.5 client is still ok

To avoid having to do that try:

sudo pg_dropclusterￜ 12 main

This reported a warning

root@datastore-1:/home/user# pg_dropcluster 12 main
Warning: corrupted cluster: data directory does not exist

... but it did its job

root@datastore-1:/home/user# sudo -u postgres psql
psql (9.5.6)
Type "help" for help.

postgres=# \q

Thanks, you saved my day again!

Moreno.

On 7/3/20 8:15 AM, Moreno Andreo wrote:

Il 03/07/2020 16:51, Adrian Klaver ha scritto:

On 7/3/20 1:54 AM, Moreno Andreo wrote:

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

OK, it confirms that 9.5 client is still ok

To avoid having to do that try:

sudo pg_dropclusterￜ 12 main

This reported a warning

Yeah, I'm guessing the original uninstall clean up process went off the
rails here:

"
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):
"

The below just finished what the above started.

root@datastore-1:/home/user# pg_dropcluster 12 main
Warning: corrupted cluster: data directory does not exist

... but it did its job

root@datastore-1:/home/user# sudo -u postgres psql
psql (9.5.6)
Type "help" for help.

postgres=# \q

Thanks, you saved my day again!

Moreno.

--
Adrian Klaver
adrian.klaver@aklaver.com