[ubuntu] Help Me for fix login error

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http://ubuntuforums.org – i'm newbie on ubuntu user (i use ubuntu 10.10 on my acer aspire 4736z intel) i install package macbuntu themes, on tutor I was asked to install ubuntu tweak. when i install that missing error so, i restart when boot, different login view, i type username n password, then startx so many script, i don't understand on last script, i read this missing error fatal server error: no such screen found ....... xinit: no such or directory xinit: no such process server error pleas help me for this error (Hardware)