在Debian中使用apt-get安装软件包时经常会提示让你插入netinst的光盘：
Media change: please insert the disc labeled
当没有时就无法进行安装了， 这时可以打开文件/etc/apt/sources.list文件，注释掉cdrom那一行，
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#
# deb cdrom:[Debian GNU/Linux 6.0.7 _Squeeze_ - Official amd64 DVD Binary-1 20130223-14:06]/ squeeze contrib main
#deb cdrom:[Debian GNU/Linux 6.0.7 _Squeeze_ - Official amd64 DVD Binary-1 20130223-14:06]/ squeeze contrib main
# Line commented out by installer because it failed to verify:
#deb http://security.debian.org/ squeeze/updates main contrib
# Line commented out by installer because it failed to verify:
#deb-src http://security.debian.org/ squeeze/updates main contrib
# squeeze-updates, previously known as 'volatile'
# A network mirror was not selected during install. The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
# deb http://ftp.debian.org/debian/ squeeze-updates main contrib
# deb-src http://ftp.debian.org/debian/ squeeze-updates main contrib
deb http://mirrors.163.com/debian/ squeeze main contrib non-free
deb http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt all main
# added by zhjx
deb http://download.virtualbox.org/virtualbox/debian squeeze contrib non-free
然后再执行apt-get update更新下deb仓库，
这样以后再使用apt-get安装时就不会再搜寻cdrom了
