I remember that I had the same issue in ubuntu 9.04 using seq24 from the repositories.
It was solved just compiling the source from here:

http://www.filter24.org/seq24/download.html

Have you tried this?
cheers,
Diego


2010/10/26 Louigi Verona <louigi.verona@gmail.com>
Eh ) I just wish someone would fix seq24 for Ubuntu 9.04. So far, I've never even had the chance to use it since none of the versions for Ubuntu 9.04 work.


--
Louigi Verona
http://www.louigiverona.ru/

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