[ubuntu] Need a little help cleaning it up a fresh install.

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http://ubuntuforums.org – I just installed ubuntu12.04 on a Asus EEE Pc 901. Well bad thing is it only has a 4gig hard and 2nd hard of 16gig. Sure I could have installed it on the 2nd but I was hoping to install it on the 4gig as it is 4x faster then the 16gig. My question/story is I went to do a update and it needs 500mb of space but only 300mb left. So I thought why not use software center to remove the stuff that this eee pc wont ever use. But the bad part is I removed it but it increased in size usage. Sure the apps are not on the list but the diskspace increased rather then decrease. I was wondering is there a (Hardware)