KDEnlive blank effects panel on Ubuntu - the solution

I've started to learn KDEnlive, and I wanted to add some nice fade out effect to the end of my video. However the effects panel was totally white, and couldn't find the solution. I am using Ubuntu 23.04 currently.

Finally what I did, is that I added the Ubuntu PPA from the official site (you can also use AppImage, if you just want to try it out, since it doesn't add any dependencies).

sudo add-apt-repository ppa:kdenlive/kdenlive-stable

Then update our sources.list:

sudo apt update

And finally install KDEnlive

sudo apt install kdenlive

It's good if you installed the frei0r-plugins package, which is basically the effects package:

sudo apt install frei0r-plugins

After installing from PPA, I could see and use effects without problem. Hope that helps for you as well.