Hi Stan,
1. No, I do not have any mods installed. Here is the my directory structure -
amit@amit-ubuntu:~/snap/0ad$ ls -lrt
total 8
lrwxrwxrwx 1 amit amit 3 Sep 17 22:51 current -> 239
drwxr-xr-x 2 amit amit 4096 Sep 17 22:56 common
drwxr-xr-x 5 amit amit 4096 Sep 17 22:56 239
amit@amit-ubuntu:~/snap/0ad/239/.local/share/0ad/mods$ pwd
/home/amit/snap/0ad/239/.local/share/0ad/mods
amit@amit-ubuntu:~/snap/0ad/239/.local/share/0ad/mods$ ls -lrt
total 4
drwx------ 2 amit amit 4096 Sep 17 22:56 user
2. What do you mean by using PPA? As you might already know, I installed "latest/stable" snap from ubuntu software center