[ubuntu] Text to Speech with Linux

I am trying toinstall Text to Speech software and am flowing this video (FreeText to Speech with Linux – YouTube). I got this error:

norman@norman-GA-770T-USB3:~$apt-get install festival

E: Could not openlock file /var/lib/dpkg/lock - open (13: Permission denied)

E: Unable to lockthe administration directory (/var/lib/dpkg/), are you root?

How can I fix this?
Thank you