Doesn't work, possibly the dependencies?

[Caedorus]

So, if I input a playlist it says 'imported 0 files from playlist " "'. If I enter a single video, it simply does not respond, as if I hadn't pressed the button.
I have seen the dependencies on ffmpeg and yt-dlp, but while everyone seems just to install them with apt I cannot. Even sudo mount -o remount,rw / does not allow apt to install either: it says it depends on something which "isn't going to be installed".
UT 20.04 Development channel r378.
Help appreciated!

Logs: https://dpaste.com/7DS66GCTG

EDIT: just realised that link expires in 7 days, if it no longer works ping me I have a backup.

[Caedorus]

Update: manually installing ffmpeg and yt-dlp did not help.