Call for testing: Musescore 4.6.0

pachulo · October 11, 2025, 8:18pm

Hey everyone! It’s been quite a long, but thanks to @Kyuyrii work, we were able to update the snap to the next major version and MuseScore 4.6.0 is now in the latest/candidate channel for amd64 & arm64 archs; unfortunately armhf & i386 are not supported anymore:

sudo snap install musescore --channel=candidate

Some interfaces need to be connected manually:

sudo snap connect musescore:alsa
sudo snap connect musescore:removable-media

But most of the application functionality should work without them.

This is a major release, so, if you’re a user of the application or even if you just want to poke at it, I’d love some help putting it through its paces! Specially, if you can try printing from MuseScore and reporting if you were successfull or it failed, that would be great!

Please let me know if you run into any issues.

ndyer · December 10, 2025, 5:58pm

Thanks for doing this! I use MuseScore a fair bit, and it’s great to see the snap package being updated.

I have an issue with a lack of audio. When you click play, the playback cursor freezes in the first bar, no audio is output, and the message

ALSA lib seq.c:935:(snd_seq_open_noupdate) Unknown SEQ hw

keeps being output every few seconds.

MIDI input seems broken as well: “No device”

Audio works fine on the 4.6.3 AppImage from the MuseScore website.

Printing worked fine.

pachulo · December 24, 2025, 4:05pm

Hi! Thanks for testing!

One question: did you manually connect the alsa interface, right?

sudo snap connect musescore:alsa

tbss1 · December 31, 2025, 6:36pm

i have the same error

using pipewire with the experimental ubuntu core desktop

yes, experimental

tbss1 · December 31, 2025, 6:49pm

ingolf · January 6, 2026, 6:54am

Hi,

same issue here on Ubuntu 22.04.5 LTS:

no audio
playback cursor does not move

In addition to the message reported by @ndyer, there was

12:07:04.307 | INFO  | main_thread     | audio::IAudioDriver> makeLinuxAudioDriver | Using audio driver: ALSA
ALSA lib dlmisc.c:339:(snd_dlobj_cache_get0) Cannot open shared library libasound_module_pcm_pulse.so (/usr/lib/x86_64-linux-gnu/alsa-lib/libasound_module_pcm_pulse.so: cannot open shared object file: No such file or directory)
12:07:04.312 | ERROR | main_thread     | AlsaAudioDriver::open | Unable to open device: default, err code: -6
12:07:04.312 | ERROR | main_thread     | AudioModule::setupAudioDriver | audio output open failed

(Audio API currently set to “ALSA Audio”; keeping the default PipeWire fails in the same way)

I did

sudo snap connect musescore:alsa
sudo snap connect musescore:removable-media

before starting.

snap list musescore
Name       Version  Rev  Tracking          Publisher   Notes
musescore  4.6.0    234  latest/candidate  musescore✓  -

Apart from this issue, Musescore is quite useful to me. Thanks a lot!

Ingolf

pachulo · January 6, 2026, 9:56pm

Hi! I’ve created this issue in my GitHub repo, to see if @Kyuyrii can help us.

pachulo · January 7, 2026, 11:33am

OK, thanks to @Kyuyrii (again!) we have a new build on the latest/beta channel, which should solve this and also bumps MuseScore to the 4.6.5 version. Can you test that one and see if everything works fine?

Thanks!

ingolf · January 8, 2026, 6:35am

Hi, @pachulo and @Kyuyrii,

I confirm that audio output/playback works with the latest/beta as in

Name       Version  Rev  Aufzeichnung  Herausgeber  Hinweise
musescore  4.6.5    236  latest/beta   musescore✓   -

Thanks a lot! Ingolf

pachulo · January 13, 2026, 9:23pm

Can you retry the tests with the new version @ndyer & @tbss1 ? Thanks!

tbss · January 13, 2026, 11:39pm

Sorry, to try i need to use the ubuntu core desktop

In short, the experimental version

But i’m using in kde linux and in thisnmomment works better tham appimage and flatpak

ndyer · January 21, 2026, 3:31pm

Audio playback now works, on the current candidate 4.6.5.

MIDI is still broken.

Edit: I ran it in debug mode, and am seeing AlsaMidiInPort::connect | Connected to -1

which implies that it’s trying to connect, running through this function, and finding a code path where the connection has failed but no good error message was output.

github.com/musescore/MuseScore

src/framework/midi/internal/platform/lin/alsamidiinport.cpp

v4.6.5


      
                      return make_ret(Err::MidiFailedConnect,  "failed connect, err: " + std::string(snd_strerror(err)));
                  }
          
                  m_deviceID = deviceID;
                  ret = run();
              } else {
                  m_deviceID = deviceID;
              }
          
              if (ret) {
                  LOGD() << "Connected to " << m_deviceID;
              }
          
              return ret;
          }
          
          void AlsaMidiInPort::disconnect()
          {
              if (!isConnected()) {
                  return;
              }

pachulo · January 23, 2026, 11:07pm

Some questions @ndyer :

But is MIDI working on version 3.6.2?
Can you try again with the latest version on latest/candidate? @Kyuyrii added the libportmidi0 library to the snap (thanks again!)

ndyer · February 4, 2026, 11:16am

I’m still getting “unknown SEQ hw” and “No device” using the latest/candidate, revision 238.

With latest/stable: Segmentation fault (core dumped)

This is on 25.10 questing, by the way - although I’ve seen the same segfault for a while.

pachulo · February 4, 2026, 9:49pm

OK, so I guess it’s fine to push this to the stable channel then.