po dlhsom case som sa k tomu dostal:
môj /etc/apt/sources/list:
deb 
http://www.ubnt.com/downloads/unifi/distros/deb/debian debian ubiquiti
deb 
http://downloads-distro.mongodb.org/repo/debian-sysvinit dist 10gen
Robím to podľa tohto návodu:
http://community.ubnt.com/t5/UniFi-Updates-Blog/UniFi-3-2-1-is-released/ba-p/872360 A tu je výpis chyb:
dpkg: error processing mongodb-10gen (--configure):
 subprocess installed post-installation script returned error exit status 1
configured to not write apport reports
                                      dpkg: dependency problems prevent configuration of unifi-beta:
 unifi-beta depends on mongodb-10gen (>= 2.0.0) | mongodb-server (>= 2.0.0); however:
  Package mongodb-10gen is not configured yet.
  Package mongodb-server is not installed.
dpkg: error processing unifi-beta (--configure):
 dependency problems - leaving unconfigured
configured to not write apport reports
                                      Errors were encountered while processing:
 mongodb-10gen
 unifi-beta
E: Sub-process /usr/bin/dpkg returned an error code (1)