表題のとおり、最新版のUbuntuをインストールしたところ。
全く音がでません。過去の投稿を確認し確認しましたが、全く改善しません。
どなたか、ご教授いただきますよう宜
しくお願いいします。
　
【PC】
HP
Pavilion tx2000

【各種データ】
・cat /proc/asound/devices
  2:        : timer
  3:        : sequencer
  4: [ 0- 6]: digital audio playback
  5: [ 0- 6]: digital audio capture
  6: [ 0- 2]: digital audio capture
  7: [ 0- 1]: digital audio playback
  8: [ 0- 0]: digital audio playback
  9: [ 0- 0]: digital audio capture
10: [ 0]   : control

・aplay -l
**** ハードウェアデバイス PLAYBACK のリスト ****
カード 0: SB [HDA ATI SB], デバイス 0: ALC268 Analog [ALC268 Analog]
  サブデバイス: 1/1
  サブデバイス #0: subdevice #0
カード 0: SB [HDA ATI SB], デバイス 1: ALC268 Digital [ALC268 Digital]
  サブデバイス: 1/1
  サブデバイス #0: subdevice #0
カード 0: SB [HDA ATI SB], デバイス 6: Si3054 Modem [Si3054 Modem]
  サブデバイス: 1/1
  サブデバイス #0: subdevice #0

・cat ~/.xsession-errors
/etc/gdm/Xsession: Beginning session setup...
Setting IM through im-switch for locale=ja_JP.
Start IM through /etc/X11/xinit/xinput.d/ja_JP linked to /etc/X11/xinit/xinput.d/iiimf.
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
I: caps.c: Dropping root privileges.
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
N: main.c: Called SUID root and real-time and/or high-priority scheduling was requested in the configuration. However, we lack the necessary privileges:
N: main.c: We are not in group 'pulse-rt', PolicyKit refuse to grant us the requested privileges and we have no increase RLIMIT_NICE/RLIMIT_RTPRIO resource limits.
N: main.c: For enabling real-time/high-priority scheduling please acquire the appropriate PolicyKit privileges, or become a member of 'pulse-rt', or increase the RLIMIT_NICE/RLIMIT_RTPRIO resource limits for this user.
GNOME_KEYRING_SOCKET=/tmp/keyring-sorsDw/socket
SSH_AUTH_SOCK=/tmp/keyring-sorsDw/socket.ssh

(gnome-settings-daemon:3446): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed

(gnome-settings-daemon:3446): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
Checking for Xgl: not present.
xset q doesn't reveal the location of the log file. Using fallback /var/log/Xorg.0.log
Detected PCI ID for VGA:
Checking for texture_from_pixmap: not present.
Trying again with indirect rendering:
Checking for texture_from_pixmap: present.
Checking for non power of two support: present.
Checking for Composite extension: present.
Checking screen 1Comparing resolution (1280x800) to maximum 3D texture size (8192): Passed.
Checking for Software Rasterizer: Not present.
Checking for nVidia: not present.
Checking for FBConfig: present.
running under gnome seesion, checking for gnomecompat
Checking for Xgl: not present.
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format
I/O warning : failed to load external entity "/home/crea/.compiz/session/10850d67e59fd944ef125362472057480200000032690019"
Starting gtk-window-decorator
** (gnome-panel:3544): DEBUG: Adding applet 0.
** (gnome-panel:3544): DEBUG: Initialized Panel Applet Signaler.

(gnome-panel:3544): libglade-WARNING **: Unexpected element <requires-version> inside <glade-interface>.
** (nm-applet:3561): DEBUG: applet_common_device_state_changed
** (nm-applet:3561): DEBUG: old state indicates that this was not a disconnect 0
** (nm-applet:3561): DEBUG: applet_common_device_state_changed
** (nm-applet:3561): DEBUG: foo_client_state_changed_cb
** (gnome-panel:3544): DEBUG: Adding applet 1.
** (gnome-panel:3544): DEBUG: Adding applet 2.
** (gnome-panel:3544): DEBUG: Adding applet 3.
** (gnome-panel:3544): DEBUG: Adding applet 4.
Initializing nautilus-open-terminal extension

** (nautilus:3545): WARNING **: Unable to add monitor: サポートしていません
/usr/lib/linuxmint/mintUpdate/mintUpdate.py:1226: GtkWarning: gtk_toolbar_set_icon_size: assertion `icon_size != GTK_ICON_SIZE_INVALID' failed
  wTree = gtk.glade.XML(gladefile, "window1")
ping: unknown host google.com
** (gnome-panel:3544): DEBUG: Adding applet 5.
** (nm-applet:3561): DEBUG: applet_common_device_state_changed
** (gnome-panel:3544): DEBUG: Adding applet 6.
** (nm-applet:3561): DEBUG: applet_common_device_state_changed
** (nm-applet:3561): DEBUG: foo_client_state_changed_cb
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 170.652/170.652/170.652/0.000 ms
Traceback (most recent call last):
  File "/usr/lib/rhythmbox/plugins/rb/Loader.py", line 43, in _contents_cb
    (contents, length, etag) = file.load_contents_finish(result)
glib.GError: Bad Request
/var/lib/python-support/python2.6/gdata/tlslite/utils/cryptomath.py:9: DeprecationWarning: the sha module is deprecated; use the hashlib module instead
  import sha
libdvdread: Using libdvdcss version 1.2.10 for DVD access
libdvdread: Attempting to use device /dev/sr0 mounted on /media/cdrom0 for CSS authentication

libdvdread: Attempting to retrieve all CSS keys
libdvdread: This can take a _long_ time, please be patient

libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x0000011f
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_0.VOB at 0x00001663
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x0000172a
libdvdread: Elapsed time 1
libdvdread: Found 1 VTS's
libdvdread: Elapsed time 1
libdvdnav: Using dvdnav version 1.1.16.3 from http://xine.sf.net
libdvdnav: Can't read name block. Probably not a DVD-ROM device.
libdvdnav: Unable to find map file '/home/crea/.dvdnav/.map'
libdvdnav: DVD disk reports itself with Region mask 0x00fd0000. Regions: 2
demux_wavpack: (open_wv_file:127) open_wv_file: non-seekable inputs aren't supported yet.
libdvdnav: Language 'en' not found, using 'ja' instead
libdvdnav: Menu Languages available: ja
libdvdnav: Language 'en' not found, using 'ja' instead
libdvdnav: Menu Languages available: ja
libdvdnav: Language 'en' not found, using 'ja' instead
libdvdnav: Menu Languages available: ja
libdvdnav: Language 'en' not found, using 'ja' instead
libdvdnav: Menu Languages available: ja
libdvdnav: Language 'en' not found, using 'ja' instead
libdvdnav: Menu Languages available: ja
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 161.712/161.712/161.712/0.000 ms
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 166.178/166.178/166.178/0.000 ms
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 170.741/170.741/170.741/0.000 ms
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 164.014/164.014/164.014/0.000 ms
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 164.527/164.527/164.527/0.000 ms
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 166.202/166.202/166.202/0.000 ms
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 168.768/168.768/168.768/0.000 ms
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 168.779/168.779/168.779/0.000 ms
PING google.com (74.125.67.100) 56(84) bytes of data.

--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 166.781/166.781/166.781/0.000 ms

【症状】
ログイン時のサウンド、CD、DVD、動画ファイルの音がでない
【確認したこと】
・ボリュームの確認(右上のパネルとalsamixerの2箇所)
・サウンドの設定より自動検出から他の項目を選択
・alsa-base.confの編集（以下の記述を追加）
　　alias snd-card-0 snd-hda-ati
　　options snd-hda-ati model=hp enable-msi=1 probe-mask=1
・pulse削除（今は再度、インストールしております）

以上になります。過去の投稿内容や回答に似たケースもございますが
どれも改善出来ませんでした。
初心者ゆえ、おかしな投稿になってしまっているかもしれませんが
宜しくお願いいします。