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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Vivek Gadge <vvkgadge56@gmail.com>
cc: pgsql-general@lists.postgresql.org
Subject: Re: PostgreSQL Upgrade Issue - Undefined Symbol Error
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Comments: In-reply-to Vivek Gadge <vvkgadge56@gmail.com>
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Vivek Gadge <vvkgadge56@gmail.com> writes:
> I am encountering an error after completion of PostgreSQL upgradation from
> version 13.8 to 15.6. Trying to describe a single table, I am receiving an
> error.

> psql: symbol lookup error: psql: undefined symbol: PQmblenBounded

This indicates that your psql executable is linking to an old version
of libpq.so.  (Running "ldd" on the psql file should confirm that.)
You may have a problem with the library search path being used by the
dynamic loader.

			regards, tom lane