[ubuntu] Lost Internet Coection After 14.04 Update for Network Manager

Updated recent software updates that included libnm-util2, libnm-glib-vpn1,
network manager, gir1.2 network manager 1.0 and libnm-glib4. These packages
will not load due to "not being authenticated". Tried synaptic and gave
waing about malicious packages.

Tried various command lines:

sudo service network-manager restart

sudo apt-get --purge autoremove network-manager && sudo apt-get install network-manager

All have failed. How can I resolve my inteet coection?