Serial ports(in 1.0.5 & Port in 1.6.11) is greyed out under tools
Information on a “Serial Port Setup” page at fedorahosted.org should be adequate to sort the problem manually.  Here are a few snippets from that page, along with notes about application to the current problem.

• Use command ls -l /dev/ttyUSB* to find out the serial port's group.  For example, on my Ubuntu system that shows

crw-rw---- 1 root dialout 188, 0 Aug 20 11:13 /dev/ttyUSB0


Note, substitute for ttyUSB if the port you're concerned about doesn't start with that.

• Use command groups to find out which groups you belong to.

• The fedorahosted page says to use command sudo adduser (username) dialout to add dialout to your groups list.  I haven't tried that approach, and would be more inclined to instead try sudo usermod -a -G dialout (username) [where  “(username)” represents your username].