Yes I am trying to authenticate the package. The md5sum mathc so we are good on that part. I can't use apt-get because right now I am using Freenix (FreeSlack) and that is why I was trying to ensure that I have the right package from the right person. The way that I add the key file is using the command gpg --import. When I executed the last command (gpg --import) it doesn't gave me any error.