HELP!!!Arduino Yun CANNOT upload!

This is my error message, please help me.... I have debugged it all day...


avrdude: AVR device initialized and ready to accept instructions
avrdude: Device signature = 0x1e9587
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "0xFF"
avrdude: writing lfuse (1 bytes):
avrdude: 1 bytes of lfuse written
avrdude: verifying lfuse memory against 0xFF:
avrdude: load data lfuse data from input file 0xFF:
avrdude: input file 0xFF contains 1 bytes
avrdude: reading on-chip lfuse data:
avrdude: verifying ...
avrdude: 1 bytes of lfuse verified
avrdude: reading input file "0xD8"
avrdude: writing hfuse (1 bytes):
avrdude: 1 bytes of hfuse written
avrdude: verifying hfuse memory against 0xD8:
avrdude: load data hfuse data from input file 0xD8:
avrdude: input file 0xD8 contains 1 bytes
avrdude: reading on-chip hfuse data:
avrdude: verifying ...
avrdude: 1 bytes of hfuse verified
avrdude: reading input file "0xFB"
avrdude: writing efuse (1 bytes):
avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0xFB:
avrdude: load data efuse data from input file 0xFB:
avrdude: input file 0xFB contains 1 bytes
avrdude: reading on-chip efuse data:
avrdude: verifying ...
avrdude: 1 bytes of efuse verified
avrdude: reading input file "/tmp/sketch.hex"
avrdude: writing flash (32748 bytes):
avrdude: 32748 bytes of flash written
avrdude: verifying flash memory against /tmp/sketch.hex:
avrdude: load data flash data from input file /tmp/sketch.hex:
avrdude: input file /tmp/sketch.hex contains 32748 bytes
avrdude: reading on-chip flash data:
avrdude: verifying ...
avrdude: 32748 bytes of flash verified

avrdude done. Thank you.

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