kdenlive on Linux Mint
It is recommended to download the AppImage version until at least version 5.11 of Qt was include into Ubuntu.
More detail on Kdenlive release repository
Current stable AppImage (19.04.3) is available here. To install, just download the file and make it executable.
If you dont want to download this script, you can run:
curl -s https://git.cclaude.rocks/install/kdenlive-install/raw/master/kdenlive-install.sh | bash