我想apt-get purge firefox在ubuntu14.04LTS中执行此操作，但它显示ubuntu-mate-desktop如果我执行此操作，我的也会被删除。
$ sudo apt-get purge firefox
[sudo] password for tiger:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
caja-extensions-common caja-gksu caja-open-terminal caja-sendto dconf-editor
eom eom-common libgtksourceview2.0-0 libgtksourceview2.0-common
libmate-sensors-applet-plugin0 libmatedict6 mate-applets mate-applets-common
mate-icon-theme-faenza mate-media mate-netspeed mate-sensors-applet
mate-themes mate-utils mate-utils-common pluma pluma-common
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
firefox* ubuntu-mate-desktop*
0 upgraded, 0 newly installed, 2 …