I have uploaded the program many times in my Arduino Uno board but recently my serial port is not detected before this error,it detects two serial port now it is showing error and another serial port is not detected.....I found answer for this problem but how to disable other serial ports in fedora....
On Windows, if the software is slow to start or crashes on launch, or the Tools menu is slow to open, you may need to disable Bluetooth serial ports or other networked COM ports in the Device Manager. The Arduino software scans all the serial (COM) ports on your computer when it starts and when you open the Tools menu, and these networked ports can sometimes cause large delays or crashes.
Try a recent linux live cd for comparison and see how the serial ports are detected there.
If you can do a "loop-back-test" with the live cd (no compiler needed, just the IDE or other serial terminal, e.g. minicom), then your fedora 14 has a driver / misconfiguration issue.
I had the same problen in a Fedora 13, receiving a grey line in the serial port, no matter the dmesg command reported the device /dev/ttyASC01 was active. I saw the same with the device /dev/ttyUSB01.
The solution was to login as root, and the serial port was available.
Later I changed the privileges of /dev/ttyUSB01 from 660 to 666 (read write for everyone), but the problem with the normal user remains the same.