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@egils Please use their Forum for troubleshooting the game. I cannot reproduce your issue.

I get the following error: LZDoom 3.86a - 2020-06-21 15:49:37 +0200 - SDL version Compiled on Jun 23 2020

LZDoom version 3.86a
M_LoadDefaults: Load system defaults.
W_Init: Init WADfiles.
 adding /usr/share/lzdoom/lzdoom.pk3, 711 lumps
 adding /usr/share/lzdoom/game_support.pk3, 291 lumps
 adding /usr/share/games/doom/freedoom1.wad, 2703 lumps
I_Init: Setting up machine state.
CPU Vendor ID: GenuineIntel
  Name: Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz
  Family 6, Model 15, Stepping 11
  Features: MMX SSE SSE2 SSE3 SSSE3 HyperThreading
V_Init: allocate screen.
S_Init: Setting up sound.
I_InitSound: Initializing OpenAL
  Opened device Built-in Audio Analog Stereo
ST_Init: Init startup screen.
Checking cmd-line parameters...
S_InitData: Load sound definitions.
G_ParseMapInfo: Load map definitions.
Texman.Init: Init texture manager.
ParseTeamInfo: Load team definitions.
LoadActors: Load actor definitions.
script parsing took 304.43 ms
R_Init: Init Doom refresh subsystem.
DecalLibrary: Load decals.
Adding dehacked patch freedoom1.wad:DEHACKED
Patch installed
M_Init: Init menus.
P_Init: Init Playloop state.
ParseSBarInfo: Loading custom status bar definition.
===========================================================================
This is Freedoom, the free content first person shooter.

Freedoom is freely redistributable under the terms of the modified BSD
license. Check out the Freedoom website for more information:

    https://freedoom.github.io/
============================================================================
D_CheckNetGame: Checking network game status.
player 1 of 1 (1 nodes)
Using video driver x11
OpenGL acceleration requires at least OpenGL 3.0. No Acceleration will be used.
Resolution: 640 x 480
ALSA lib pcm_dmix.c:1090:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map
connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=Filen eller katalogen finns inte)
attempt to connect to server failed
connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=Filen eller katalogen finns inte)
attempt to connect to server failed
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_dmix.c:1090:(snd_pcm_dmix_open) unable to open slave
connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=Filen eller katalogen finns inte)
attempt to connect to server failed
fluidsynth: warning: SDL2 not initialized, SDL2 audio driver won't be usable

my fluidsynth seems to startup fine. I use pulseaudio and my config looks like this:

# Mandatory parameters (uncomment and edit)
#SOUND_FONT=/usr/share/soundfonts/default.sf2

# Additional optional parameters (may be useful, see 'man fluidsynth' for further info)
#OTHER_OPTS='-a alsa -m alsa_seq -r 48000'
OTHER_OPTS='-a pulseaudio -m alsa_seq -r 48000'

$ fluidsynth -a pulseaudio

    ALSA lib pcm_dmix.c:1090:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map
connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)
attempt to connect to server failed
connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)
attempt to connect to server failed
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_dmix.c:1090:(snd_pcm_dmix_open) unable to open slave
connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)
attempt to connect to server failed
FluidSynth runtime version 2.1.4
Copyright (C) 2000-2020 Peter Hanappe and others.
Distributed under the LGPL license.
SoundFont(R) is a registered trademark of E-mu Systems, Inc.
fluidsynth: warning: Failed to set thread to high priority
fluidsynth: Using PulseAudio driver
Type 'help' for help topics.
> fluidsynth: warning: Failed to set thread to high priority