Missed this bit.
You could try figure out where that file "SoftAp0" comes from:
dpkg -S SoftAp0
sudo grep SoftAp0 -R /etc/
What is displayed when you run below 3:
sudo /usr/bin/pihole-FTL
strings /usr/bin/pihole-FTL | head -1
readlink /lib/ld-linux.so.3