问当虚拟包依赖于/recommeds/建议而没有真正的包依赖/recommeds/建议时会发生什么？

EN

root@debian:/# cat /etc/os-release |grep ^PRETTY_NAME
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
root@debian:/# aptitude --disable-columns show lxpanel
Package: lxpanel                         
Version: 0.9.3-1
State: not installed
Priority: optional
Section: x11
Maintainer: Debian LXDE Maintainers <pkg-lxde-maintainers@lists.alioth.debian.org>
Architecture: i386
Uncompressed Size: 753 k
Depends: libasound2 (>= 1.0.16), libatk1.0-0 (>= 1.12.4), libc6 (>= 2.7), libcairo2 (>= 1.2.4), libfm-gtk4 (>= 1.2.0), libfm4 (>= 1.2.0), libfontconfig1 (>= 2.11), libfreetype6
         (>= 2.2.1), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.41.1), libgtk2.0-0 (>= 2.24.0), libiw30 (>= 30~pre1), libkeybinder0 (>= 0.3.0), libmenu-cache3 (>= 0.5.0),
         libpango-1.0-0 (>= 1.14.0), libpangocairo-1.0-0 (>= 1.14.0), libpangoft2-1.0-0 (>= 1.14.0), libwnck22 (>= 2.30.7), libx11-6, libxml2 (>= 2.7.4), lxmenu-data, lxpanel-data
         (= 0.9.3-1), libfm-modules
Recommends: xkb-data, x-terminal-emulator, pavucontrol | gnome-alsamixer
Suggests: menu, firefox-esr | firefox | www-browser
Description: LXDE panel
 LXPanel is a GUI application for the Lightweight X11 Desktop Environment (LXDE). 

 It is derived from fbpanel and includes the following features: 

 * User-friendly application menu automatically generated from .desktop files on the system 
 * Launcher bar (small icons clicked to launch apps) 
 * Task bar supporting ICCCM/EWMH `urgency' hint (Pidgin IM windows can flash on new incoming messages) 
 * Run dialog (type a command to run, without opening a terminal) 
 * Net status icon plug-in (optional). 
 * Volume control plug-in (optional). 
 * Notification area (system tray). 
 * Digital clock. 
 * Keyboard LEDs plug-in (display caps/num locks). 
 * lxpanelctl: control lxpanel from other programs. For example, "lxpanelctl run" will show the Run dialog in lxpanel, and "lxpanelctl menu" will show the application menu. This
   is useful in combination with window manager key bindings.
Homepage: http://www.lxde.org/
Tags: hardware::input:mouse, interface::graphical, interface::x11, role::program, scope::utility, suite::TODO, uitoolkit::gtk, use::TODO, works-with::software:package,
      works-with::software:running, x11::applet, x11::application

root@debian:/# 

root@debian:~/debian_stretch# debootstrap stretch ./ http://ftp.cn.debian.org/debian/ >/dev/null
root@debian:~/debian_stretch# mount --bind /sys ./sys
root@debian:~/debian_stretch# mount --bind /proc ./proc
root@debian:~/debian_stretch# chroot ./
root@debian:/# apt update >/dev/null 2>&1
root@debian:/# echo Y |apt upgrade >/dev/null 2>&1
root@debian:/# echo n |apt install lxde-core 2>&1| grep -o termit
termit
termit
root@debian:/# echo n |apt install lxde-core 2>&1| grep -o lxterminal
root@debian:/# echo n |apt-get install lxde-core 2>&1| grep -o termit
termit
termit
root@debian:/# echo n |apt-get install lxde-core 2>&1| grep -o lxterminal
root@debian:/# apt-cache policy termit
termit:
  Installed: (none)
  Candidate: 3.0-1+b1
  Version table:
     3.0-1+b1 500
        500 http://ftp.cn.debian.org/debian stretch/main i386 Packages
root@debian:/# apt-cache policy lxterminal
lxterminal:
  Installed: (none)
  Candidate: 0.3.0-2
  Version table:
     0.3.0-2 500
        500 http://ftp.cn.debian.org/debian stretch/main i386 Packages
root@debian:/#