Instalei o GrandOrgue e ele não esta abrindo

Eu instalei o programa GrandOrgue, por meio de flatpack. Mas quando vou abrir o programa, seja pelo icone ou seja pelo terminal, o programa não abre. Pelo terminal ele dá as seguintes linhas:

Gtk-Message: 10:41:24.280: Failed to load module "appmenu-gtk-module"
Gtk-Message: 10:41:24.348: Failed to load module "canberra-gtk-module"
Gtk-Message: 10:41:24.348: Failed to load module "canberra-gtk-module"
ALSA lib pcm_direct.c:2003:(snd1_pcm_direct_parse_open_conf) The field ipc_gid must be a valid group (create group audio)
ALSA lib pcm_direct.c:2003:(snd1_pcm_direct_parse_open_conf) The field ipc_gid must be a valid group (create group audio)
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
ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map
ALSA lib ../../oss/pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib ../../oss/pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib ../../usb_stream/pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib ../../usb_stream/pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib pcm_direct.c:2003:(snd1_pcm_direct_parse_open_conf) The field ipc_gid must be a valid group (create group audio)