Cleanup

Remove Unnecessary Packages and Dependencies

sudo apt-get autoremove

Cleanup Thumnail cache

du -sh ~/.cache/thumbnails
sudo rm -rf ~/.cache/thumbnails/*

Remove Old Kernels

sudo dpkg --list 'linux-image*'
sudo apt-get remove linux-image-VERSION

Clean Apt Cache

sudo du -sh /var/cache/apt
sudo apt-get clean

GtkOrphan (orphaned packages) - GUI support

sudo apt-get install gtkorphan