I know this has been asked before, but no one's solutions I've seen have worked so far. I just got started with Arduino and downloaded Arduino IDE from the Software Center. When trying to to set up my Serial Port, the option in the toolbar is gray/unaccessible.
I also downloaded it as a tar.xz instead of from the Software Center and had the same problem.
When I plug in my Uno, the green light turns on so I know it's being connected at least.
One solution I saw said it was a problem with my user group. However, I entered
sudo groups <username>
and came up with
<username> tty dialout sudo audio video plugdev input
so I think my groups are okay, right?
Anyway, I would really appreciate some help if anyone knows of a fix. I run 12.04 Ubuntu (I recently re-installed trying to fix this problem; I'm going to update to 14.04) on a Chromebook.