The Update manager came up with a load of stuff but hardly started before saying "Requires installation of untrusted packages
The action would require the installation of packages from unauthenticated sources."
Details: "aptdaemon aptdaemon-data banshee banshee-extension-soundmenu banshee-extension-ubuntuonemusicstore bluez bluez-alsa bluez-cups bluez-gstreamer geoclue grub-gfxpayload-lists kdebase-runtime kdebase-runtime-data kdelibs-bin kdelibs5-data kdelibs5-plugins kdoctools language-pack-en language-pack-en-base language-pack-gnome-en language-pack-gnome-en-base libbluetooth3 libgeoclue0 libgl1-mesa-dri libgl1-mesa-glx libglu1-mesa libkatepartinterfaces4 libkcmutils4 libkdecore5 libkdesu5 libkdeui5 libkdewebkit5 libkdnssd4 libkemoticons4 libkfile4 libkhtml5 libkidletime4 libkio5 libkjsapi4 libkjsembed4 libkmediaplayer4 libknewstuff3-4 libknotifyconfig4 libkntlm4 libkparts4 libkpty4 libkrosscore4 libktexteditor4 liblircclient0 libnepomuk4 libnepomukquery4a libnepomukutils4 libplasma3 libreoffice-base-core libreoffice-calc libreoffice-common libreoffice-core libreoffice-draw libreoffice-emailmerge libreoffice-gnome libreoffice-gtk libreoffice-help-en-us libreoffice-impress libreoffice-math libreoffice-style-human libreoffice-writer libsolid4 libthreadweaver4 libxi6 light-themes linux-firmware plasma-scriptengine-declarative plasma-scriptengine-javascript python-aptdaemon python-aptdaemon-gtk python-aptdaemon.gtk3widgets python-aptdaemon.gtkwidgets python-cupshelpers python-uno software-center system-config-printer-common system-config-printer-gnome system-config-printer-udev ttf-opensymbol unattended-upgrades uno-libs3 upstart ure whois xserver-xorg-video-intel"
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