Ubuntu 22.04下MIDI编辑器无法调用FluidSynth软合成器播放MIDI文件的问题求助

各位好，我在Ubuntu 22.04 LTS上折腾MIDI播放的问题，现在遇到了瓶颈，想请大家帮忙看看。目前我已经能让VLC正常播放.mid格式的文件，但Qtractor、MidiEditor这类专门的MIDI编辑器却始终没法播放，核心问题都是找不到MIDI输出设备。我不想使用外接硬件设备，只想和VLC一样用FluidSynth软合成器来处理MIDI播放。

已完成的操作（VLC播放成功） #

我通过安装以下两个包组，成功让VLC能播放MIDI文件：

sudo apt-get install fluid-soundfont-gm fluid-soundfont-gs
sudo apt-get install vlc-plugin-fluidsynth

遇到的具体问题 #

1. Qtractor无法初始化音频/MIDI引擎 #

打开Qtractor时直接弹出错误提示：

The audio/MIDI engine could not be initialized. Make sure the JACK audio server (jackd) and/or the ALSA Sequencer kernel module (snd-seq-midi) are up and running and then restart the session.

2. 安装qsynth/qjackctl时遇到依赖冲突 #

我查了资料，说安装qsynth或者qjackctl可能能解决软合成器的调用问题，但执行安装命令时终端提示依赖未满足，无法完成安装：

myComputer:~/SW$ sudo apt install qsynth

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
midieditor : Depends: qtbase5-dev but it is not going to be installed
Depends: qtdeclarative5-dev but it is not going to be installed
Depends: libqt5webkit5-dev but it is not going to be installed
Depends: libsqlite3-dev but it is not going to be installed
Depends: qt5-default but it is not installable
Depends: qtmultimedia5-dev but it is not going to be installed
Depends: qttools5-dev-tools
Depends: libqt5multimedia5-plugins but it is not going to be installed
Depends: gstreamer1.0-plugins-bad but it is not going to be installed
Depends: gstreamer1.0-doc but it is not installable
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

请问大家有没有办法解决这个问题？怎么让MIDI编辑器能正常调用FluidSynth软合成器，同时解决这个依赖安装的问题呢？

备注：内容来源于stack exchange，提问作者Prokop Hapala