That just means you have a library directory named "Blink" but there are no '.h' files in the directory. You can ignore the message or fix it by deleting the directory:
/home/utopistmaker/Arduino/libraries/Blink
That just means you have a library directory named "Blink" but there are no '.h' files in the directory. You can ignore the message or fix it by deleting the directory:
/home/utopistmaker/Arduino/libraries/Blink