Cannot see GUI in Debian

I installed Debian using the graphical install option (I followed almost similar steps shows by you) I also selected 'Graphical desktop environment' & 'standard systems utility'; but I don't understand why am I not able to see a GUI. Is there a command to activate it? all I get is a prompt to log-in and after I log-in it is a plain command line. Please assist!

Moderator note: Post moved from this tutorial thread, https://www.techspot.com/community/...lling-debian-6-0-4-linux.180360/#post-1371732
 
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