Install Updates Error

[Peejay]

I have been unable to carry out an update today and the log says to post it here.
I should be glad of help in having the problem resolved.

===========================
Install Updates Error log
===========================
Install Updates could not successfully download and install available updates.
Go to https://www.freecinema2022.gq/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Reading package lists...
Building dependency tree...
Reading state information...
Calculating upgrade...
The following packages were automatically installed and are no longer required:
  libllvm4.0 ocqt562-libqt5core5a ocqt562-libqt5dbus5 ocqt562-libqt5gui5
  ocqt562-libqt5keychain1 ocqt562-libqt5network5 ocqt562-libqt5opengl5
  ocqt562-libqt5printsupport5 ocqt562-libqt5sql5 ocqt562-libqt5sql5-sqlite
  ocqt562-libqt5webkit5 ocqt562-libqt5widgets5 ocqt562-libqt5xml5
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed
  libdrm-common libllvm5.0 linux-headers-4.4.0-109
  linux-headers-4.4.0-109-generic linux-image-4.4.0-109-generic
  linux-image-extra-4.4.0-109-generic ocqt562+240-libqt5core5a
  ocqt562+240-libqt5dbus5 ocqt562+240-libqt5gui5 ocqt562+240-libqt5keychain1
  ocqt562+240-libqt5network5 ocqt562+240-libqt5printsupport5
  ocqt562+240-libqt5sql5 ocqt562+240-libqt5sql5-sqlite
  ocqt562+240-libqt5webkit5 ocqt562+240-libqt5widgets5 ocqt562+240-libqt5xml5
The following packages will be upgraded:
  ca-certificates-java chromium-codecs-ffmpeg-extra corosync corosync-dbg
  corosync-dev corosync-doc corosync-notifyd curl distro-info-data dpkg
  dpkg-dev evince evince-common firefox firefox-locale-en
  flashplugin-installer gir1.2-javascriptcoregtk-4.0 gir1.2-networkmanager-1.0
  gir1.2-webkit2-4.0 grub-common grub-pc grub-pc-bin grub2-common
  initramfs-tools initramfs-tools-bin initramfs-tools-core ipxe-qemu
  libcfg-dev libcfg6 libcmap-dev libcmap4 libcorosync-common-dev
  libcorosync-common4 libcpg4 libcurl3 libcurl3-gnutls libdpkg-perl
  libdrm-amdgpu1 libdrm-intel1 libdrm-nouveau2 libdrm-radeon1 libdrm2
  libegl1-mesa libevdocument3-4 libevview3-3 libgbm1 libgl1-mesa-dri
  libgl1-mesa-glx libglapi-mesa libgles2-mesa libgweather-3-6
  libgweather-common libjavascriptcoregtk-4.0-18 libnm-glib-vpn1 libnm-glib4
  libnm-util2 libnm0 libowncloudsync0 libpoppler-glib8 libpoppler58
  libpulse-mainloop-glib0 libpulse0 libpulsedsp libpython2.7
  libpython2.7-minimal libpython2.7-stdlib libpython3.5 libpython3.5-minimal
  libpython3.5-stdlib libquorum5 libraw15 libsam4 libseccomp2 libssl1.0.0
  libtotem-pg5 libunity-control-center1 libva-drm1 libva-x11-1 libva1
  libvotequorum7 libwayland-egl1-mesa libwebkit2gtk-4.0-37
  libwebkit2gtk-4.0-37-gtk2 libxatracker2 libxcursor1 libxfont1 libxml2
  libxml2-utils linux-firmware linux-generic linux-headers-generic
  linux-image-generic linux-libc-dev lite-software lite-sources
  lite-usermanager mesa-vdpau-drivers network-manager openssl owncloud-client
  owncloud-client-l10n poppler-utils pulseaudio pulseaudio-module-bluetooth
  pulseaudio-module-x11 pulseaudio-utils python-libvirt python-libxml2
  python2.7 python2.7-minimal python3.5 python3.5-minimal rsync spotify-client
  squashfs-tools syncthing thunderbird thunderbird-locale-en
  thunderbird-locale-en-gb thunderbird-locale-en-us tor-web-browser
  ubuntu-mono va-driver-all virtualbox virtualbox-dkms virtualbox-guest-dkms
  virtualbox-guest-utils virtualbox-guest-x11 virtualbox-qt yad
130 to upgrade, 17 to newly install, 0 to remove and 0 not to upgrade.
Need to get 519 MB of archives.
After this operation, 422 MB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  ocqt562+240-libqt5core5a ocqt562+240-libqt5dbus5 ocqt562+240-libqt5network5
  ocqt562+240-libqt5gui5 ocqt562+240-libqt5widgets5
  ocqt562+240-libqt5printsupport5 ocqt562+240-libqt5sql5
  ocqt562+240-libqt5webkit5 owncloud-client-l10n ocqt562+240-libqt5keychain1
  ocqt562+240-libqt5xml5 ocqt562+240-libqt5sql5-sqlite owncloud-client
  libowncloudsync0
E: There were unauthenticated packages and -y was used without --allow-unauthenticated

============End==========

Thank you

[Valtam]

Looks like you've tried to add Ownlcloud at some point. See this thread here - https://github.com/owncloud/client/issues/6034

[Peejay]

Many thanks, Jerry. I wasn't aware of all the problems with owncloud-client but it was only a trial by me so I completely removed. I also had to process the 'autoremove' recommendations, which I hadn't realised could affect an update - I know now!
So I'm all up to date now again. Thanks for your prompt resonse, as ever.