自定义快捷方式无法识别多媒体键

I'm in the process of getting 20.04 setup after having upgraded from 19.04, and part of it is getting my MM keys to work with spotify. While trying to make the custom shortcuts, I have run into a problem. On pre-existing system shortcuts, the MM keys on my keyboard are registered as valid inputs, and can be assigned:

enter image description here

但是,在尝试将按键绑定分配给自定义快捷方式时,无法识别该按键,因此我留在此屏幕上:

enter image description here

到目前为止我尝试过的是:

  • I tried with a second keyboard (also with media keys), to no avail
  • I tried to bind a key and unbind it, also no help
  • Looked around in gnome-tweaks in case something got added/updated but couldn't find anything.
  • Came across this post, however, the solution there now shoots an error:
david@david-pc:~$ gsettings set org.gnome.settings-daemon.plugins.media-keys previous ''
expected value:
  (empty input)
  ^

这是一个错误,还是我做错了什么?无论哪种方式,我都希望有一个答案/解决方法。

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