- pre-create additional directories to ensure correct ownership - depend on java 8 (if you have both 7 and 8 installed, it's awkward to uninstall 7 to force 8 if you have any packages setup for 1.6+ or 1.7+ ports) also note: I'm seeing some problems on one machine with unifi 4.8.14 (though another is ok), be sure to backup before upgrading from an earlier working version.