我安装的 错误：

[root@conquersky ~]# apt-get install gnome-core
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
  GConf2 ORBit2 a52dec alsa-utils at-spi cairo cairo-devel control-center
  eel2 eog epiphany evolution-data-server firefox gail gedit glib2
  glib2-devel glitz gnome-applets gnome-backgrounds gnome-desktop
  gnome-icon-theme gnome-keyring gnome-media gnome-menus gnome-mime-data
  gnome-panel gnome-session gnome-system-monitor gnome-terminal
  gnome-themes gnome-utils gnome-vfs2 gnome-vfs2-smb gnome-volume-manager
  gnutls gstreamer gstreamer-plugins gstreamer-tools gtk2 gtk2-devel
  gtk2-engines gtksourceview gucharmap howl howl-libs kdmtheme libavc1394
  libbonobo libbonoboui libgail-gnome libgcrypt libgnome libgnomecanvas
  libgnomecups libgnomeprint22 libgnomeprintui22 libgnomeui libgsf libgtop2
  libnotify librsvg2 libsoup libwnck libxklavier metacity mozilla
  mozilla-nspr mozilla-nss nautilus nautilus-cd-burner
  nautilus-open-terminal notification-daemon nuoveXT-gnome pango
  pango-devel startup-notification vte xscreensaver-base
  xscreensaver-extras xscreensaver-gl-extras yelp
The following packages will be upgraded
  alsa-utils firefox glib2 glib2-devel gtk2 gtk2-devel kdmtheme pango
  pango-devel
The following NEW packages will be installed:
  GConf2 ORBit2 a52dec at-spi cairo cairo-devel control-center eel2 eog
  epiphany evolution-data-server gail gedit glitz gnome-applets
  gnome-backgrounds gnome-core gnome-desktop gnome-icon-theme gnome-keyring
  gnome-media gnome-menus gnome-mime-data gnome-panel gnome-session
  gnome-system-monitor gnome-terminal gnome-themes gnome-utils gnome-vfs2
  gnome-vfs2-smb gnome-volume-manager gnutls gstreamer gstreamer-plugins
  gstreamer-tools gtk2-engines gtksourceview gucharmap howl howl-libs
  libavc1394 libbonobo libbonoboui libgail-gnome libgcrypt libgnome
  libgnomecanvas libgnomecups libgnomeprint22 libgnomeprintui22 libgnomeui
  libgsf libgtop2 libnotify librsvg2 libsoup libwnck libxklavier metacity
  mozilla mozilla-nspr mozilla-nss nautilus nautilus-cd-burner
  nautilus-open-terminal notification-daemon nuoveXT-gnome
  startup-notification vte xscreensaver-base xscreensaver-extras
  xscreensaver-gl-extras yelp
9 upgraded, 74 newly installed, 0 removed and 123 not upgraded.
Need to get 2537kB/102MB of archives.
After unpacking 266MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://apt.magiclinux.org magiclinux/gnome gnome-themes 2.12.3-1 [2537kB]
Fetched 1B in 2s (0B/s)
Failed to fetch http://apt.magiclinux.org/magiclinux/RPMS.gnome/gnome-themes-2.12.3-1.noarch.rpm  Size mismatch
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?


不知道那里出错误了阿？  大家帮忙看看是怎么回事阿  谢谢了