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Hi Rui,

I was able now to compile it. After following the instruction in your link I still didn't have LASPA and DSSI support, but after sudo apt-get build-dep qtractor this works now too. With qtractor I can start it and I get sound.

Now there's the problem that some plugins doesn't work at all. E.g. when loading samplv1it immediately crashes. The output in the terminal is shown below.
Also there doesn't seem to be any core dump?

Cheers, Marco

fox@fox-MS-7817:~$ qtractor
Warning: no translation found for 'de_DE' locale: /usr/share/qt5/translations/qt_de_DE.qm
Fontconfig warning: "/home/fox/.config/fontconfig/fonts.conf", line 14: reading configurations from ~/.fonts.conf is deprecated. please move it to /home/fox/.config/fontconfig/fonts.conf manually
qtractorLv2PluginType::lv2_open()
qtractorMainForm::updateSessionPre()
qtractorMidiEngine::resetAllControllers(0)
qtractorMainForm::updateSessionPost()
qtractorMidiEngine::resetDrift()
qtractorMainForm::viewRefresh()
qtractorMidiEngine::resetAllControllers(1)
qtractorMidiControl::sendAllControllers(0)
qtractorMainForm::trackAdd()
qtractorTrackForm::updateChannel(0, -1, -1, -1)
qtractorTrackForm::updateBanks("", -1, -1, -1)
qtractorTrackForm::updatePrograms("", -1, -1)
qtractorMidiBus[0x1397020]::setPatch(0, "", 0, -1, -1)
/usr/local/bin/qtractor_plugin_scan: hello. (version 0.9.0)
qtractor_ladspa_scan_file("/usr/lib/ladspa/3BandEQ-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/3BandSplitter-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/adsr_1653.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/adsr_1680.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/alias_1407.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/allpass_1895.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/am_pitchshift_1433.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ambisonic0.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ambisonic1.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ambisonic2.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ambisonic3.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/amp.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/amp_1181.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/amp_1654.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/AmplitudeImposer-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/analogue_osc_1416.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/bandpass_a_iir_1893.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/bandpass_iir_1892.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/blvco.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/bode_shifter_1431.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/bode_shifter_cv_1432.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/branch_1673.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/butterworth_1902.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/caps.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/chebstortion_1430.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/cmt.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/comb_1190.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/comb_1887.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/comb_splitter_1411.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/const_1909.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/crossover_dist_1404.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/cs_chorus.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/cs_phaser.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/CycleShifter-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/dahdsr_2021.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/dc_remove_1207.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/decay_1886.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/decimator_1202.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/declip_1195.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/delay.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/delay_1898.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/delayorama_1402.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/difference_2030.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/diode_1185.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/divider_1186.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/dj_eq_1901.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/dj_flanger_1438.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/dyson_compress_1403.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/fad_delay_1192.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/fast_lookahead_limiter_1913.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/filter.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/flanger_1191.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/fm_osc_1415.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/fmod_1656.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/foldover_1213.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/foverdrive_1196.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/freq_tracker_1418.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/g2reverb.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/gate_1410.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/giant_flange_1437.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/gong_1424.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/gong_beater_1439.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/gsm_1215.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/gverb_1216.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/hard_limiter_1413.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/Harmless-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/harmonic_gen_1220.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/hermes_filter_1200.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/highpass_iir_1890.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/hilbert_1440.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/imp_1199.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/impulse_1885.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/interpolator_1660.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/inv_1429.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/jamincont_1912.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/karaoke_1409.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/Larynx-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/latency_1914.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/lcr_delay_1436.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/lowpass_iir_1891.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/lp4pole_1671.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ls_filter_1908.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/MaBitcrush-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/MaFreeverb-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/MaGigaverb-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/MaPitchshift-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/matrix_ms_st_1421.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/matrix_spatialiser_1422.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/matrix_st_ms_1420.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/mbeq_1197.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/mod_delay_1419.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/Modulay-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/multivoice_chorus_1201.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/mvchpf24.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/mvclpf24.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/MVerb-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/noise.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/notch_iir_1894.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/phasers_1217.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/PingPongPan-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/pitch_scale_1193.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/pitch_scale_1194.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/plate_1423.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/pointer_cast_1910.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/product_1668.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/pulse_1645.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/quantiser100_2029.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/quantiser20_2027.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/quantiser50_2028.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/random_1661.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/rate_shifter_1417.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ratio_2034.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/retro_flange_1208.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/revdelay_1605.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ringmod_1188.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/satan_maximiser_1408.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sawtooth_1641.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sc1_1425.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sc2_1426.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sc3_1427.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sc4_1882.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sc4m_1916.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/se4_1883.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sequencer16_1677.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sequencer32_1676.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sequencer64_1675.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/shaper_1187.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/Shiroverb-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sifter_1210.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sin_cos_1881.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sine.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/single_para_1203.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sinus_wavewrapper_1198.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/smooth_decimate_1414.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/SoulForce-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/split_1406.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/square_1643.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/step_muxer_1212.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/stereo-plugins.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sum_1665.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/surround_encoder_1401.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/svf_1214.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sync_pulse_2023.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/sync_square_1678.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_autopan.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_chorusflanger.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_deesser.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_doubler.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_dynamics_m.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_dynamics_st.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_echo.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_eq.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_eqbw.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_limiter.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_pinknoise.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_pitch.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_reflector.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_reverb.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_rotspeak.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_sigmoid.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_tremolo.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_tubewarmth.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tap_vibrato.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tape_delay_1211.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/tracker_2025.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/transient_1206.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/triangle_1649.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/triple_para_1204.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/valve_1209.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/valve_rect_1405.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/vco_sawpulse.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/vynil_1905.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/wave_terrain_1412.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/xfade_1915.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamAutoSat-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZaMaximX2-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamComp-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamCompX2-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamDelay-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamDynamicEQ-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamEQ2-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamGate-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamGateX2-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamGEQ31-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamHeadX2-ladspa.so")
convolution: samplerate mismatch preset:48000 host:44100
convolution: samplerate mismatch preset:48000 host:44100
convolution: samplerate mismatch preset:48000 host:44100
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamPhono-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamTube-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZaMultiComp-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZaMultiCompX2-ladspa.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/ZamVerb-ladspa.so")
convolution: samplerate mismatch preset:48000 host:44100
convolution: samplerate mismatch preset:48000 host:44100
convolution: samplerate mismatch preset:48000 host:44100
qtractor_ladspa_scan_file("/usr/lib/ladspa/zita-reverbs.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/zm1_1428.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/zynalienwah.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/zynchorus.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/zyneq10band.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/zyneq3par.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/zynphaser.so")
qtractor_ladspa_scan_file("/usr/lib/ladspa/zynreverb.so")
/usr/local/bin/qtractor_plugin_scan: bye.
qtractorPluginFactory::createPlugin(0x16c6590, "http://samplv1.sourceforge.net/lv2", 0, 4)
qtractorLv2PluginType[0x1aba8a0]::open() uri="http://samplv1.sourceforge.net/lv2"
qtractorLv2Plugin[0x1a53640] uri="http://samplv1.sourceforge.net/lv2"
qtractor_lv2_time_position_open(0x1a53640)
qtractorLv2Plugin[0x1a53640]::setChannels(2) instances=1
Could not attach to process. If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Vorgang nicht zulässig.
fox@fox-MS-7817:~$