5.2 - upgrading PostgreSQL to 15; 15 cannot be installed

to complete the upgrade from 5.09 to 5.2x the users have to manually update postgres from 11 to 15 (see here).

Following the descreipton there …

# apt-get install --reinstall postgresql-15

worked but didn’t install any postgres 15 version.

# apt-get install postgresql-15

doesn’t work either (after apt-get remove …).

The only (new) created dir was

/usr/share/postgresql/15/

with a lot of example configs.

No dirs at

/etc/postgresql
/var/lib/postgresql

no subdirs “15” only “11”.

Any help is appreciated !