Você está tentando instalar a versão 2.20.1-0ubuntu1 de gir1.0-gtk-2.0, mas a versão atual em atualizações lúcidas é 2.20.1-0ubuntu2
Execute sudo apt-get update e tente novamente.
Não consigo instalar o gnome-shell através do Synaptic e estou recebendo o seguinte erro. Alguém por favor pode me ajudar?
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?