--- In firebird-support@yahoogroups.com, "certfb" wrote:
...
> Sorry I should have said that I am using CS 2.5.2 on Ubuntu 12.10.

It is still not clear which process handle database connection - your application's embedded attachment or worker process of Firebird CS.

> I have set up fbtracemgr to use fbemded by setting the following environment variables:
>
> export FIREBIRD=/home/myhome/experiments/firebird
> export LD_LIBRARY_PATH=/home/myhome/experiments/firebird

If you already have properly installed and worked CS you should not change environment variables.

> I have tried putting libfbtrace.so in $FIREBIRD, $FIREBIRD/plugins and even tried /opt/firebird/plugins
>
> but fbtracemgr cannot find the plugin, "Can not start trace session. There are no trace plugins loaded"

Don't change environment, make sure your account is a member of a "firebird" group and all should work without additional steps.

Regards,
Vlad

PS The guide you are referring to is *very* outdated and describes FB 1.5.