It's looking good. And that's from the reboot?
Try using sudo to run Arduino to see if it's related to permissionsnot that I see why re-plugging would help if that was the case...
Is it connected to some kind of USB hub or directly to a USB port on your computer?
ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 2012-05-08 16:09 /dev/ttyUSB0
cat: /dev/ttyUSB0: Device or resource busy
sudo lsof | grep ttyUSB
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/home/.gvfs Output information may be incomplete.upowerd 1393 root 14u CHR 188,0 0t0 8451 /dev/ttyUSB0
You will have to upgrade or disable Upower to solve this but I'm not sure how to do it
avrdude stk500_recv() programmer is not responding
Code: [Select]avrdude stk500_recv() programmer is not responding
avrdude: usbdev_open(): did not find any USB device "usb"