I installed CCSM to enable window previews in Unity. But when I went into extras, there was no 'window preview' option.
So I tried experimenting with other options in Compiz and now there are no borders in the dialogue boxes (close, minimize, restore buttons are not there, I had enabled some 'flat....' option in Compiz.
Later, I uninstalled Compiz and then reinstalled it. Now it says
"Failed to load session Ubuntu"
I can't even access through the guest account, I am new to Ubuntu.(please explain in detail).
All I have access to is the login screen (it still shows my custom wallpaper). Please help, I don't want to lose my stuff.