I also had this issue so came here and found this post.
I tried a few different commits all with the same issue.
In the end just went all the way back to the one that biulas reccomended above which is this one:
This version is working great.
I installed on a clean Linode VM like this:
git clone https://github.com/LibreTime/libretime.git
cd libretime
git checkout 9f1e41e6fa8656d2aa2dc74d2ed07026bef38593
sudo bash install -fiap
Hope this helps