in fact when you use su , without dash ( - ) , you log with the normal Environment and not with the root environment !!!
try instead : su - , perhaps ??
any way since you are new to linux (or debian) I think it is better for you ( I repeat what I had said )
" I suggest you to install knoppix on hard disk ( it works perfectly and detects most Hardware ) you can complete it, with apt-get ".
best regards bela
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