Laptop server, command line or desktop?

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I've had lubuntu installed on an old laptop for a while now, how would i go about optimizing it further like removing unneeded processes and should i boot into command line, if so how do i do it?

 

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I just followed this and it works but when i try to startx it says a bunch of stuff and i stay in command line?

Also how do i go about disabling unneeded processes?

 

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I changed it back and now it shows a login box where it was automatic before, when i enter my password it goes black then shows the box again.