[System] 8 GiB on system partition after installation - Is that okay ?

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http://www.kubuntuforums.net – I installed Ubuntu-Kubuntu 12.04.02 not long ago and before installation I didn't format the disk (I had Ubuntu 11.10 on it and upgrade from a disk didn't work for some reason) I created new partitions with GPARTED and then installed Ubuntu from a disk ( Kubuntu was installed right after with a terminal command) I didn't install too many application so far and the system partition already have 8.42 Giga Bytes on it. How is that possible ? The whole installation disk is about 800 Mega Bytes and Kubuntu probably adds about 300 Mega Bytes. I was wondering if the fil (HowTos)