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Ubuntu Studio 14.04.4 - no sound output

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cris
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Joined: 04/14/2016

Hello,

I have installed Ubuntu Studio 14.04.4 Trusty Tahr LTS on witch is it install Hydrogen.
I'm tying to configure Hydrogen to work with jackd, but, after that, i can not hear any sound.

Messages from jackd:
JackEngine::XRun: client = Hydrogen was not finished, state = Running
JackEngine::XRun: client = hydrogen-midi was not finished, state = Running
JackAudioDriver::ProcessGraphAsyncMaster: Process error

Błąd XSDError w file:///home/cris/.hydrogen/data/drumkits/DeathMetal/drumkit.xml, wiersz 1, kolumna 14: Brak dostępnej definicji dla elementu drumkit_info.

Messages from Hydrogen:
Błąd XSDError w file:///home/cris/.hydrogen/data/drumkits/DeathMetal/drumkit.xml, wiersz 1, kolumna 14: Brak dostępnej definicji dla elementu drumkit_info. (No definition is available for the item drumkit info)

(E) XMLDoc::read XML document /usr/share/hydrogen/data/drumkits/UltraAcousticKit/drumkit.xml is not valid (/usr/share/hydrogen/data/xsd/drumkit.xsd), loading may fail
(E) Legacy::load_drumkit loading drumkit with legacy code
(E) XMLDoc::read XML document /usr/share/hydrogen/data/drumkits/VariBreaks/drumkit.xml is not valid (/usr/share/hydrogen/data/xsd/drumkit.xsd), loading may fail
(E) Legacy::load_drumkit loading drumkit with legacy code

I will appreciate for any help.
Chris