I am unable to install gnome-shell through Synaptic and am getting the following error. Can someone please help me out?
vmuser@vmhub:~$ sudo apt-get install gnome-shell Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: gir1.0-atk-1.0 gir1.0-clutter-1.0 gir1.0-freedesktop gir1.0-glib-2.0 gir1.0-gtk-2.0 gir1.0-mutter-2.28 gir1.0-pango-1.0 libgirepository1.0-0 libgjs0 libmutter-private0 mesa-utils mutter mutter-common xbase-clients xserver-common xserver-xephyr Suggested packages: gnome-themes The following NEW packages will be installed: gir1.0-atk-1.0 gir1.0-clutter-1.0 gir1.0-freedesktop gir1.0-glib-2.0 gir1.0-gtk-2.0 gir1.0-mutter-2.28 gir1.0-pango-1.0 gnome-shell libgirepository1.0-0 libgjs0 libmutter-private0 mesa-utils mutter mutter-common xbase-clients xserver-xephyr The following packages will be upgraded: xserver-common 1 upgraded, 16 newly installed, 0 to remove and 163 not upgraded. Need to get 557kB/5,557kB of archives. After this operation, 16.7MB of additional disk space will be used. Do you want to continue [Y/n]? y WARNING: The following packages cannot be authenticated! libgirepository1.0-0 gir1.0-glib-2.0 gir1.0-atk-1.0 gir1.0-freedesktop gir1.0-pango-1.0 gir1.0-clutter-1.0 gir1.0-gtk-2.0 gir1.0-mutter-2.28 mutter-common libmutter-private0 xbase-clients xserver-common xserver-xephyr libgjs0 mutter mesa-utils gnome-shell Install these packages without verification [y/N]? y Err http://us.archive.ubuntu.com/ubuntu/ lucid-updates/main gir1.0-gtk-2.0 2.20.1-0ubuntu1 404 Not Found Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/g/gtk+2.0/gir1.0-gtk-2.0_2.20.1-0ubuntu1_i386.deb 404 Not Found E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?