Recommends: xkb-data, x-terminal-emulator, pavucontrol | gnome-alsamixer

What is meaning for here the x-terminal-emulator?

I find one link,but what should installed?

Is this undefined behavior?

For exmaple:

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


Below-is-old-contents(found answer)

Why prompt me "termit" will installed,Why is not "lxterminal" will installed?

I expect "lxerminal" will installed because "lxde-core" first recommend "lxterminal" ,but why is "termit" will installed?

What I did and encountered:

If you need any more information can tell me ,thank

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
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
root@debian:/# echo n |apt-get install lxde-core 2>&1| grep -o lxterminal
root@debian:/# apt-cache policy 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
  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

Again,if you need any more information can tell me ,thank

  • 1
    I made some edits to clarify the question. Please feel free to roll back me edits or change them if I got it wrong.
    – Kusalananda
    May 12 '17 at 8:24
  • You really should do something about the broken locale.
    – tripleee
    May 13 '17 at 18:02
  • 1
    What does apt-cache policy termit produce for you? Maybe also query for lxterminal and compare.
    – tripleee
    May 13 '17 at 18:04
  • @tripleee I done you suggest,but fix locale maybe disturb the test result by depends chain(I by install the locales package to fix it),so I will can't fix the locale on this question only.
    – illiterate
    May 13 '17 at 18:27
  • 1
    @illiterate then export LC_ALL=C for the session before running commands whose output you want to show us.
    – muru
    May 13 '17 at 18:54

In the trivial case, a dependency on A | B will select A if neither is installed.

However, very commonly, dependency resolution is also affected by codependencies (if resolving other dependencies ends up pulling in B anyway, A doesn't need to be installed) and pinning (if a repository with B gets a higher pin, B will be selected).

  • But this question very odd,is B installed and B is a virtual package,I not understand why final termit is installed
    – illiterate
    May 14 '17 at 5:09

If you already have a package that satisfies the virtual package x-terminal-emulator installed, I think apt considers that dependency to be satisfied. And you probably already do. Off the top of my head, I'm not sure how to check that. Though xterm, konsole, terminator and many others provide x-terminal-emulator.

  • I'm sure non-existent any x-terminal-emulator before installing
    – illiterate
    May 12 '17 at 12:08
  • Really? You don't have any x-terminal-emulators installed? So what do you type commands into? May 12 '17 at 13:37
  • 1
    Try running aptitude search '?provides(x-terminal-emulator)' and see if it outputs anything. May 12 '17 at 15:07
  • Yes, I'm very sure that ,I tried a similar way as you said
    – illiterate
    May 12 '17 at 17:13
  • If the system doesn't have X11, it won't have any X software at all. A server install or other basic console-only install would trivially exhibit this. On such systems, you log in on the hardware console, or over SSH.
    – tripleee
    May 13 '17 at 17:50

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