Extract only PHP extensions from a list:
grep "\.php$" $SECLISTS/Discovery/Web_Content/raft-large-files.txt > php-files.txt
The best wordlists are the ones you build yourself. SecLists is a foundation.
Fix: Use sudo chmod +r on the file or run your fuzzing tool with appropriate user rights.
hydra -l admin -P $SECLISTS/Passwords/Leaked-Databases/rockyou.txt ssh://192.168.1.100
Fix: Use sudo for system directories or install in your home folder.
cd ~/ # Instead of /usr/share/
git clone --depth 1 https://github.com/danielmiessler/SecLists.git
SecLists is already present, but may be an older version.
sudo apt update
sudo apt install seclists
Location: /usr/share/seclists/