How do I deal with “unauthenticated sources” errors in the Software Center?
I'm trying to install software updates but I always get this error.
Requires installation of untrusted packages The action would require the installation of packages from unauthenticated sources. Details : gir1.2-mutter-3.0 gnome-tweak-tool libmutter0 mutter-common
I don't know what it's asking me to do. Please help.