Debian Wheezyのインストールに関する問題

私は最近、4GBのnVidiaグラフィックカードを搭載したノートブックにDebian Wheezy 7.6をインストールしました。デフォルトでは、ログインするとGNOMEクラシックモードで起動して報告されます。「Gnome 3を読み込めませんでした。」。また、マウスポインタが一貫していない場合もあります（スクロールしてクリックすると表示されません）。

これは次の出力です.xsession-errors。

/etc/gdm3/Xsession: Beginning session setup...
localuser:a12 being added to access control list
openConnection: connect: No such file or directory
cannot connect to brltty at :0
gnome-keyring-daemon: insufficient process capabilities, unsecure memory might get used
gnome-keyring-daemon: insufficient process capabilities, unsecure memory might get used
gnome-keyring-daemon: insufficient process capabilities, unsecure memory might get used
gnome-keyring-daemon: insufficient process capabilities, unsecure memory might get used
GNOME_KEYRING_CONTROL=/home/a12/.cache/keyring-VJMq1w
GNOME_KEYRING_CONTROL=/home/a12/.cache/keyring-VJMq1w
SSH_AUTH_SOCK=/home/a12/.cache/keyring-VJMq1w/ssh
GNOME_KEYRING_CONTROL=/home/a12/.cache/keyring-VJMq1w
SSH_AUTH_SOCK=/home/a12/.cache/keyring-VJMq1w/ssh
GPG_AGENT_INFO=/home/a12/.cache/keyring-VJMq1w/gpg:0:1
GNOME_KEYRING_CONTROL=/home/a12/.cache/keyring-VJMq1w
SSH_AUTH_SOCK=/home/a12/.cache/keyring-VJMq1w/ssh

(gnome-settings-daemon:16895): color-plugin-WARNING **: failed to get edid: unable to get EDID for output

(gnome-settings-daemon:16895): color-plugin-WARNING **: unable to get EDID for xrandr-default: unable to get EDID for output

(gnome-settings-daemon:16895): color-plugin-WARNING **: failed to reset xrandr-default gamma tables: gamma size is zero

(gnome-panel:16921): Gtk-CRITICAL **: gtk_accelerator_parse_with_keycode: assertion `accelerator != NULL' failed

** (gnome-panel:16921): WARNING **: Unable to parse mouse modifier '(null)'

Initializing tracker-store...
vmware-user: could not open /proc/fs/vmblock/dev
Tracker-Message: Setting up monitor for changes to config file:'/home/a12/.config/tracker/tracker-store.cfg'
Tracker-Message: Setting up monitor for changes to config file:'/home/a12/.config/tracker/tracker-store.cfg'
Starting log:
  File:'/home/a12/.local/share/tracker/tracker-store.log'
Initializing tracker-miner-fs...
Tracker-Message: Setting up monitor for changes to config file:'/home/a12/.config/tracker/tracker-miner-fs.cfg'
Starting log:
  File:'/home/a12/.local/share/tracker/tracker-miner-fs.log'

** (gnome-screensaver:16959): WARNING **: Config key not handled: disable-application-handlers

** (gnome-screensaver:16959): WARNING **: Config key not handled: disable-command-line

** (gnome-screensaver:16959): WARNING **: Config key not handled: disable-log-out

** (gnome-screensaver:16959): WARNING **: Config key not handled: disable-print-setup

** (gnome-screensaver:16959): WARNING **: Config key not handled: disable-printing

** (gnome-screensaver:16959): WARNING **: Config key not handled: disable-save-to-disk

(gnome-panel:16921): Gtk-CRITICAL **: gtk_accelerator_parse_with_keycode: assertion `accelerator != NULL' failed

** (gnome-panel:16921): WARNING **: Unable to parse mouse modifier '(null)'

** Message: applet now removed from the notification area

(gnome-panel:16921): GLib-GObject-WARNING **: /tmp/buildd/glib2.0-2.33.12+really2.32.4/./gobject/gsignal.c:2459: signal `size_request' is invalid for instance `0x230b6c0'
** Message: applet now embedded in the notification area
Initializing nautilus-gdu extension

(gnome-settings-daemon:16895): updates-plugin-WARNING **: Failed to get symlink: Error when getting information for file '/run/udev/firmware-missing/ar3k/ramps_0x31010000_40.dfu': No such file or directory
Shutting down nautilus-gdu extension
Window manager warning: Log level 16: Error converting selection
Window manager warning: Log level 16: Error converting selection
Window manager warning: Log level 16: Error converting selection
Window manager warning: Log level 16: Error converting selection
Window manager warning: Log level 16: Error converting selection
Window manager warning: Log level 16: Error converting selection
Window manager warning: Log level 16: Error converting selection
Window manager warning: Log level 16: Error converting selection

(gnome-settings-daemon:16895): PackageKit-WARNING **: couldn't parse execption 'GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._pk_5ftransaction_5ferror.Code4: GetDistroUpgrades not supported by backend', please report

(gnome-settings-daemon:16895): updates-plugin-WARNING **: failed to get upgrades: GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._pk_5ftransaction_5ferror.Code4: GetDistroUpgrades not supported by backend

私はこれが何であるかわかりません。グーグルをしましたが、解決策が見つかりませんでした。私のグラフィックカードのためですか？では、どうすれば解決できますか？

アップデート：私は本当にgnome-3を望んでいませんが、クラシックモードは望んでいません。したがって、クラシックモードが十分に完全であれば十分です。