I started using Ubuntu a few days ago, so please a little help would be cool. Whenever I try to install a package from the Ubuntu Software Center it gives me the following error for everything. Can anyone explain?
Requires installation of untrusted packages
This requires installing packages from unauthenticated sources.
Details
libaacs0 libbluray1 libcddb2 libcrystalhd3 libdvbpsi7 libebml3 libiso9660-8 libmatroska5 libresid-builder0c2a libsdl-image1.2 libsdl1.2debian libsidplay2 libssh2-1 libtar0 libupnp6 libva-x11-1 libvcdinfo0 libwebp4 libxcb-keysyms1