您能帮我找出如何清除缓存文件或不必要的文件或可以在新安装的 Ubuntu 上更新的库吗？
我使用了“Ubuntu 12.10”
这是我的最大文件/文件夹列表：
4380MiB /usr
2784MiB /usr/share
1641MiB /usr/share/icons
1541MiB /usr/share/icons/codex
1424MiB /usr/share/icons/codex/.icon-theme.cache
1263MiB /usr/lib
513MiB /usr/lib/i386-linux-gnu
213MiB /usr/share/fonts
208MiB /usr/bin
199MiB /usr/share/fonts/truetype
179MiB /usr/lib/libreoffice
138MiB /usr/lib/libreoffice/program
131MiB /usr/share/locale
106MiB /usr/lib/i386-linux-gnu/wine
100MiB /usr/src
399MiB /var
196MiB /var/lib
188MiB /var/cache
88MiB /var/cache/apt-xapian-index/index.2
88MiB /var/cache/apt-xapian-index
87MiB /var/lib/apt
86MiB /var/lib/apt/lists
80MiB /var/lib/dpkg
72MiB /var/lib/dpkg/info
51MiB /var/cache/apt