How to fix apt-get tools's disk usage prediction so poorly?

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http://askubuntu.com – I use apt-get to upgrade one package,and it shows: sam@sam:~/code/ros/pcl$ sudo apt-get upgrade ros-electric-perception-pcl Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: assimp-dev firefox firefox-globalmenu flashplugin-installer icedtea-netx icedtea-plugin icedtea6-plugin libeigen3-dev libopencv2.3 libopencv2.3-bin libopencv2.3-dev libpcl-all linux-generic linux-headers-generic linux-image-generic nautilus-dropbox openrave0.6-dp-base openrave0.6-dp-plugin-bulletrave openrav (HowTos)