STOP! Don't do that!!

Just for the sake of completeness, there are two things you should definitely avoid (for that reason, it's generally a bad idea to just copypaste code from some random web board and use it without knowing what it actually does):

• Never mix apt-get and aptitude/synaptic/… (or, generally, don't mix the use of different package managers). The reason is simple: each has its own dependency management system, and each does it differently. You can easily end up with a broken system that way, because one package manager might not know what another one did to resolve dependencies.
  Instead, use "sudo apt-get install libminiupnpc-dev" for the second installation command.
• chmod 777 for a daemon software, especially on a server (!!!) is totally unnecessary and - in case of dubious software - definitely dangerous. Instead, go for "chmod u+rwo craved", which ensures that your user can read, write and execute the daemon, or, yet better, "chmod 744 craved". This way, you give the user (first number) read, write, execute (read = 4, write = 2, execute = 1) rights, as 4+2+1=7, and the group (second number) plus others (third number, which you definitely don't want to have having read, write and execute rights because this means that literally anyone can read, write and execute this file!) only read access (4).
  If that does not work because your group is required to execute it, try 774, but definitely not 777.

Posts like the quoted ones are the reason for all those insecure machines on the web which pose a big danger to their "administrators" and the general public, because they help sending annoying spam mails when they got hacked, again. But on the other hand, they give me and the company I'm working for a job.