add to /etc/apt/sources.list

## Debian Wheezy (7.0)O
deb http://www.ubnt.com/downloads/unifi/distros/deb/debian debian ubiquiti

# for Ubiquiti
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv C0A52C50

# retrieve the latest package information
apt-get update

apt-get install unifi-beta

Reading state information... Done
The following extra packages will be installed:
  ca-certificates-java icedtea-6-jre-cacao icedtea-6-jre-jamvm java-common jsvc libcommons-daemon-java libjpeg8 libnspr4 libnss3 libnss3-1d
  libpcrecpp0 libpcsclite1 mongodb-clients mongodb-server openjdk-6-jre-headless openjdk-6-jre-lib tzdata-java
Suggested packages:
  default-jre equivs java-virtual-machine pcscd libnss-mdns sun-java6-fonts ttf-dejavu-extra fonts-ipafont-gothic fonts-ipafont-mincho
  ttf-wqy-microhei ttf-wqy-zenhei ttf-indic-fonts
Recommended packages:
  default-jre-headless java2-runtime-headless
The following NEW packages will be installed:
  ca-certificates-java icedtea-6-jre-cacao icedtea-6-jre-jamvm java-common jsvc libcommons-daemon-java libjpeg8 libnspr4 libnss3 libnss3-1d
  libpcrecpp0 libpcsclite1 mongodb-clients mongodb-server openjdk-6-jre-headless openjdk-6-jre-lib tzdata-java unifi-beta
0 upgraded, 18 newly installed, 0 to remove and 0 not upgraded.
Need to get 90.9 MB of archives.
After this operation, 221 MB of additional disk space will be used.
Do you want to continue [Y/n]?