I tried installing the bootloader with no success. I carefully checked the wiring as given in the Arduino Web page. I was able to load the ISP sketch to the programmer board, but when I burn bootloader it stops with an error.
One thing--the chip on my good board is an ATmega328P-PU and the chip on the target board is an ATmega328P U. I see from another source on YouTube Burn a Bootloader onto Arduino Uno - YouTube that there is a file called avrdude.conf where a HEX number might need to be changed. If I am reading his table correctly, a "0x0F" needs to be changed to "0x14" in the file. I tried changing that value, but then the Arduino as ISP sketch gave an error while uploading.
I don't know what to do next.