If you want a hassle free preinstalled copy of Portia Web Scraper, here is a Virtual box VHD that you can download and use.
|Description||Ubuntu 14.0 without GUI , Portia Installed|
|Size||1,722,368 KB ( 1.64GB)|
|Ubuntu Username/Passowrd||portia /portiacrawler|
To use the machine, create a Virtualbox Virtual Machine , and attach this VHD to the machine. Use Bridged mode network so you can access the guest machine from host using same network subnet.
Say goodbye to all the headaches involved in installing portia, just download VM, run and use. Hope many people will find this useful.