Update requires installation of untrusted packages

[JD]

Update daemon says:
Requires installation of untrusted packages

This requires installing packages from unauthenticated sources.

Details:

bind9-host consolekit dmsetup dnsutils gnome-control-center 
gnome-control-center-data libbind9-80 libck-connector0 
libdevmapper-event1.02.1 libdevmapper1.02.1 libdns81 
libgnome-control-center1 libisc83 libisccc80 libisccfg82 liblvm2app2.2 
liblwres80 libpam-ck-connector libxml2 libxml2-utils python-libxml2 
unity-lens-files

Should anyoneproceed and install untrusted packages?