Craft 3: admin is showing "500 Internal Server Error" (apache) after fresh install
(/usr/local/lib/php/extensions/no-debug-non-zts-20170718/imagick.so.so: cannot open shared object file: Permission denied))


Does that file exist on your server?  I'm asking because the .so.so extension seems odd.  If it does and it's just .so, it might be as simple as editing your php.ini file so it's loading imagick.so instead of imagick.so.so.

If you php.ini file is already loading imagick.so and that file exists on your server at that location, then check the permissions of that file and make sure that whatever user:group your web server is running as has permissions to read that file.