我想知道什么是extra，suggested，recommended和NEW包？有什么不同？当我想安装新软件包时，为什么需要这些信息？
这是我输入时的终端输出sudo apt-get install calibre：
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
calibre-bin fonts-mathjax imagemagick libchm1 libjs-jquery libjs-mathjax
libjs-sphinxdoc libjs-underscore libpodofo0.9.0 python-apsw python-cherrypy3
python-cssselect python-cssutils python-dateutil python-markdown
python-mechanize python-netifaces python-pyparsing python-repoze.lru
python-routes
Suggested packages:
imagemagick-doc autotrace curl enscript ffmpeg gnuplot grads hp2xx html2ps
libwmf-bin mplayer povray radiance transfig ufraw-batch javascript-common
fonts-mathjax-extras libjs-mathjax-doc python-apsw-doc python-markdown-doc
python-paste
Recommended packages:
libmagickcore5-extra python-pygments …