/home/pi/Downloads/arduino-1.8.8/hardware/arduino/avr/libraries/Wire/src should contain a file named Wire.h. If not, there must be something wrong with your installation of the Arduino IDE. I recommend downloading a fresh copy and installing that.
/home/pi/Downloads/arduino-1.8.8/hardware/arduino/avr/libraries/Wire/src should contain a file named Wire.h. If not, there must be something wrong with your installation of the Arduino IDE. I recommend downloading a fresh copy and installing that.