ISSUE_01 - PostgresSQL + Python3

arkaghosh@lat7410g:~$ sudo su - postgres
postgres@lat7410g:~$ psql -c 'CREATE EXTENSION plpython3u'
ERROR:  could not open extension control file "/usr/share/postgresql/12/extension/plpython3u.control": No such file or directory
postgres@lat7410g:~$ exit
logout

arkaghosh@lat7410g:~$ sudo service postgresql status
● postgresql.service - PostgreSQL RDBMS
     Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor preset: enabled)
     Active: active (exited) since Thu 2023-05-04 20:35:44 IST; 20min ago
    Process: 1294 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
   Main PID: 1294 (code=exited, status=0/SUCCESS)

May 04 20:35:44 lat7410g systemd[1]: Starting PostgreSQL RDBMS...
May 04 20:35:44 lat7410g systemd[1]: Finished PostgreSQL RDBMS.

arkaghosh@lat7410g:~$ sudo apt-get install postgresql-contrib postgresql-plpython3-15.2
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package postgresql-plpython3-15.2
E: Couldn't find any package by glob 'postgresql-plpython3-15.2'
E: Couldn't find any package by regex 'postgresql-plpython3-15.2'