I have same problem with mixxx. It crashes on startup. avel@hackercb:~$ LANG=C; gdb --args /usr/bin/mixxx --controllerDebug --developer GNU gdb (Ubuntu 7.8-1ubuntu4) 7.8.0.20141001-cvs Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: . Find the GDB manual and other documentation resources online at: . For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/bin/mixxx...(no debugging symbols found)...done. (gdb) run Starting program: /usr/bin/mixxx --controllerDebug --developer [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Debug [Main]: Mixxx 1.10.1 "(built on: Jun 29 2012 @ 15:14:12; flags: hifieq mad midiscript optimize qdebug shoutcast verbose vinylcontrol)" is starting... Debug [Main]: Qt version is: 4.8.6 Debug [Main]: Configuration file is at the current version 1.10.1 Debug [Main]: Loading translations for locale "C" from translations folder "/usr/share/mixxx/translations/" : fail Debug [Main]: Found folder 'Mixxx' within default OS music directory Debug [Main]: Could not create folder 'Recordings' within 'Mixxx' [New Thread 0x7fffe28fd700 (LWP 27384)] [New Thread 0x7fffe1d88700 (LWP 27385)] Debug [Main]: ControlObject::getControl returning NULL for ( "[Channel1]" , "vinylcontrol_mode" ) Debug [Main]: ControlObject::getControl returning NULL for ( "[Channel2]" , "vinylcontrol_mode" ) Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Debug [Main]: Available QtSQL drivers: ("QSQLITE", "QMYSQL3", "QMYSQL") Debug [Main]: src/library/trackcollection.cpp DB status: true Debug [Main]: SchemaManager::upgradeToSchemaVersion already at version 13 Debug [Main]: TrackDAO::initialize QThread(0xb5f310, name = "Main") "qt_sql_default_connection" Debug [Main]: CrateDAO::initialize() Debug [Main]: CueDAO::initialize QThread(0xb5f310, name = "Main") "qt_sql_default_connection" Debug [Main]: Promo dir: "/usr/share/mixxx//promo/1.8.0/index.html" [New Thread 0x7fffe11a3700 (LWP 27387)] Debug [Main]: Traktor Library Location=[ "/home/pavel/collection.nml" ] [New Thread 0x7fffe09a2700 (LWP 27388)] Debug [Main]: ControlObject::getControl returning NULL for ( "[Flanger]" , "lfoDepth" ) Debug [Main]: ControlObject::getControl returning NULL for ( "[Flanger]" , "lfoDelay" ) Debug [Main]: ControlObject::getControl returning NULL for ( "[Flanger]" , "lfoPeriod" ) Debug [Main]: CachingReader using 4980736 bytes. Debug [Main]: CachingReader using 4980736 bytes. Debug [Main]: CachingReader using 4980736 bytes. Debug [Main]: CachingReader using 4980736 bytes. Debug [Main]: CachingReader using 4980736 bytes. Debug [Main]: CachingReader using 4980736 bytes. Debug [Main]: Constructed LibraryScanner Debug [Main]: iTunes Album Art path is: "" Debug [Main]: MidiDeviceManager::getDeviceList Debug [Main]: Scanning PortMIDI devices: Debug [Main]: Found output device # 0 Midi Through Port-0 Debug [Main]: Found input device # 1 Midi Through Port-0 Debug [Main]: Linking to output device # 0 "Midi Through Port-0" Debug [Main]: Starting script engine with output device "" [New Thread 0x7fffcb9c4700 (LWP 27389)] [New Thread 0x7fffcb1c3700 (LWP 27390)] Debug [MidiScriptEngine 1]: MIDI Device in script engine is: "" Debug [Main]: MidiDeviceManager: Setting up devices Debug [Main]: PortMIDI device "1. Midi Through Port-0" already closed Debug [Main]: MidiMapping: Loading MIDI preset from "/home/pavel/.mixxx/midi/Midi_Through_Port-0.midi.xml" Debug [Main]: Could not open xml file: "/home/pavel/.mixxx/midi/Midi_Through_Port-0.midi.xml" Debug [Main]: Promo dir: "/usr/share/mixxx//promo/1.8.0/index.html" [New Thread 0x7fffc9e84700 (LWP 27391)] Warning [Main]: Bus::open: Can not get ibus-daemon's address. Debug [Main]: IBusInputContext::createInputContext: no connection to ibus-daemon Debug [Main]: loadSettings: 1 0 "" Debug [Main]: slotApply crossfader: 1 "" Debug [Main]: BPM Scheme File ConfigKey not set or file missing... setting to "/home/pavel/.mixxx/mixxxbpmscheme.xml" Debug [Main]: BpmSchemes::readXML "/home/pavel/.mixxx/mixxxbpmscheme.xml" Debug [Main]: BPM Scheme: "/home/pavel/.mixxx/mixxxbpmscheme.xml" does not exist. Debug [Main]: MidiDeviceManager::getDeviceList Debug [Main]: MidiDeviceManager::getDeviceList Debug [Main]: SoundManager::setupDevices() Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method Warning [Main]: failed to resolve JACK name method .... A lot of that messages Warning [Main]: failed to resolve JACK name method Program received signal SIGSEGV, Segmentation fault. 0x00007ffff0e82e17 in _IO_vfprintf_internal (s=0x7fffff7ff4d0, format=0x77a647 "Warning %s", ap=0x7fffff801bf8) at vfprintf.c:257 257 vfprintf.c: No such file or directory. (gdb)