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xpasky | on: Why does everyone run ancient Postgres versions?
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  postgres    1958  0.0  0.0 247616 26040 ?        S    Jul21   3:03 /usr/lib/postgresql/11/bin/postgres
  postgres 1085195  0.0  0.0 249804 24740 ?        Ss   Aug19   2:01 /usr/lib/postgresql/13/bin/postgres
  postgres 1085196  0.0  0.0 223240 27900 ?        Ss   Aug19   1:59 /usr/lib/postgresql/15/bin/postgres
Postgres is the only thing on my Debian that doesn't seamlessly automatically upgrade across dist-upgrades, but instead leaves old versions around for me to deal with manually... which I seem to never get around to.
heavyset_go | parent
That's because you install versioned packages like postgresql-15: https://tracker.debian.org/pkg/postgresql-15

That way you can have multiple versions of the same package.