Some of the common issues include:
Uploading a sketch to the Galileo board: If uploading the code to the board doesn't work, there are several things you can check. First, check that you installed the latest version of the Arduino IDE for the Intel Galileo. Note that it won't work with the normal Arduino IDE.
Then, check that you selected the correct board inside the Arduino IDE (Galileo Gen 2) and the correct serial port. To be sure that you have the right serial port, make sure you don't have any other serial devices connected to your computer.
If it still doesn't work, you can also check the official Getting Started guide at https://software.intel.com/en-us/articles/intel-galileo-board-assembly.
The temperature sensor is returning abnormal readings: It can happen that the...