make install full this manual
https://code.google.com/p/bigbluebutton/wiki/090InstallationUbuntu

now have problem how fix? in plesk nginx

/var# sudo apt-get install -f nginx
Reading package lists... Done
Building dependency tree
Reading state information... Done
nginx is already the newest version.
nginx set to manually installed.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
nginx : Depends: nginx-core (>= 1.4.6-1ubuntu3.1) but it is not going to be installed or
nginx-full (>= 1.4.6-1ubuntu3.1) but it is not going to be installed or
nginx-light (>= 1.4.6-1ubuntu3.1) but it is not going to be installed or
nginx-extras (>= 1.4.6-1ubuntu3.1) but it is not going to be installed or
nginx-naxsi (>= 1.4.6-1ubuntu3.1) but it is not going to be installed
Depends: nginx-core (< 1.4.6-1ubuntu3.1.1~) but it is not going to be installed or
nginx-full (< 1.4.6-1ubuntu3.1.1~) but it is not going to be installed or
nginx-light (< 1.4.6-1ubuntu3.1.1~) but it is not going to be installed or
nginx-extras (< 1.4.6-1ubuntu3.1.1~) but it is not going to be installed or
nginx-naxsi (< 1.4.6-1ubuntu3.1.1~) but it is not going to be installed
nginx-full-dbg : Depends: nginx-full (= 1.4.6-1ubuntu3.1) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

you have installed plesk ?

you have installed any another application use nginx you must verify so you must watch the disponibility of port 8080.
So you must stopped plesk and show if port 8080 is free or no , if not make you sure that you have any another project use.
sudo netstat -lpn |grep :8080