Musescore won't playback anything

Hi!
I've been trying to work on my own sonata, but all of a sudden the playback stopped working.
I've tried:
- Resetting to factory settings
- Checking the soundfont in both the Mixer and Synthesizer
- Changing the audio output in Preferences > I/O

Also, it's not a headphones issue because I can still listen to YouTube videos.

Musescore version 3.6.2
System: Linux