ow to install all desktops environments in Ubuntu 12.10?

[Edmond Condillac]

Hi

The system boots showing Xubuntu 12.10. Then the Ubuntu screen appears, but no log in features show. However, BleachBit opens. Then a dialog asks for entry of password for keyring 'default' to unlock. There appears an alert message regarding a crash report that " an application has crashed". Among the numerous additional details the following have been noted:
1) Ubuntu has experienced an internal error
2) Executable Path: /usr/share/apport/apport checkresume
3)Package linux-image-3.5.0-24-generic3.5.0-24.37
4) Problem Type: Kernel Oops
6) Failurew Suspend/resume

I would be most grateful for your kind help. After booting from options in the Boot Device Menu, the Desk top Environment shows the wallpaper only without any icons nor the Applications Menu, which usually appears along the left of the screen. There is no notification tray with icons to download available software updates nor icons regarding notification of crashed programs. All that is visible after booting is the desktop wallpaper with none of the Desk top icons. I have tried to access the CLI terminal with Ctrl+Alt+T hotkeys but there is no response. Likewise no command prompt console is available, having unsuccessfully tried Ctrl+Alt+F1 hotkeys.
Kindly help and advise. Your kind help and advice are most appreciated to help me with this problem.
Best regards
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