[ubuntu-za] Untrusted sources

[Alf C Stockton]

I am attempting to install updates to my Ubuntu 11.10 and system keeps
telling me :-
Requires installation of untrusted packages
and under details shows:-
acpi-support libmission-control-plugins0 libsnmp-base libsnmp15
libssl1.0.0 libxml2 libxml2-utils linux-generic linux-generic-pae
linux-headers-3.0.0-20 linux-headers-3.0.0-20-generic
linux-headers-3.0.0-20-generic-pae linux-headers-generic
linux-headers-generic-pae linux-image-3.0.0-20-generic
linux-image-3.0.0-20-generic-pae linux-image-generic
linux-image-generic-pae linux-libc-dev openssl python-libxml2 sudo
telepathy-mission-control-5 ubuntu-desktop ubuntu-minimal ubuntu-standard
update-manager update-manager-core vim-common vim-tiny
xserver-xorg-video-intel

Please tell me what I have done wrong.

-- 
Regards,
Alf Stockton        www.stockton.co.za