** Description changed:

+ 
+ Steps to reproduce:
+ 1. Have Ubuntu installed
+ 2. Ensure that there no obsolete packages in the system with `aptitude search 
'?obsolete'`
+ 2. Launch deborphan or GtkOrphan
+ 
+ Expected results:
+ * deborphan or GtkOrphan do not show any orphaned packages
+ 
+ Actual results:
+ * deborphan or GtkOrphan wrongly show orphaned packages
+ 
+ 
+ Examples:
+ 1. Ubuntu 14.04 LTS - both program report that `libmpdec2`, 
`activity-log-manager-control-center`, `gstreamer1.0-alsa`, 
`libreoffice-presentation-minimizer`, `gnomine`, `libqpdf13` are orphan but 
this is not true:
+ 
+ ```
+ $ apt-cache policy $(deborphan)
+ libmpdec2:
+   Installed: 2.4.0-6
+   Candidate: 2.4.0-6
+   Version table:
+  *** 2.4.0-6 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
+         100 /var/lib/dpkg/status
+ activity-log-manager-control-center:
+   Installed: 0.9.7-0ubuntu14.2
+   Candidate: 0.9.7-0ubuntu14.2
+   Version table:
+  *** 0.9.7-0ubuntu14.2 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
+         100 /var/lib/dpkg/status
+      0.9.7-0ubuntu14 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
+ gstreamer1.0-alsa:
+   Installed: 1.2.4-1~ubuntu2.1
+   Candidate: 1.2.4-1~ubuntu2.1
+   Version table:
+  *** 1.2.4-1~ubuntu2.1 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
+         500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 
Packages
+         100 /var/lib/dpkg/status
+      1.2.3-1 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
+ libreoffice-presentation-minimizer:
+   Installed: 1:4.2.8-0ubuntu5.5
+   Candidate: 1:4.2.8-0ubuntu5.5
+   Version table:
+  *** 1:4.2.8-0ubuntu5.5 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
+         500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 
Packages
+         100 /var/lib/dpkg/status
+      1:4.2.3~rc3-0ubuntu2 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
+ gnomine:
+   Installed: 1:3.10.1-0ubuntu1
+   Candidate: 1:3.10.1-0ubuntu1
+   Version table:
+  *** 1:3.10.1-0ubuntu1 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
+         100 /var/lib/dpkg/status
+ libqpdf13:
+   Installed: 5.1.1-1
+   Candidate: 5.1.1-1
+   Version table:
+  *** 5.1.1-1 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
+         100 /var/lib/dpkg/status
+ 
+ ```
+ 
+ 2. Ubuntu 14.04 LTS - both programs report that `libllvm3.8`, `libegl1
+ -mesa-drivers`, `libmircommon5`, `iproute`, `libavahi-compat-libdnssd1`,
+ `libqpdf17`, `libqmi-glib1`, `libproxy1-plugin-gsettings`, `libproxy1
+ -plugin-networkmanager`, `ubuntu-core-launcher` but this is not true:
+ 
+ ```
+ $ apt-cache policy $(deborphan)
+ libllvm3.8:
+   Installed: 1:3.8-2ubuntu4
+   Candidate: 1:3.8-2ubuntu4
+   Version table:
+  *** 1:3.8-2ubuntu4 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
+         100 /var/lib/dpkg/status
+      1:3.8-2ubuntu1 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+ libegl1-mesa-drivers:
+   Installed: 12.0.6-0ubuntu0.16.04.1
+   Candidate: 12.0.6-0ubuntu0.16.04.1
+   Version table:
+  *** 12.0.6-0ubuntu0.16.04.1 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 
Packages
+         100 /var/lib/dpkg/status
+      11.2.0-1ubuntu2 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
+ libmircommon5:
+   Installed: 0.21.0+16.04.20160330-0ubuntu1
+   Candidate: 0.21.0+16.04.20160330-0ubuntu1
+   Version table:
+  *** 0.21.0+16.04.20160330-0ubuntu1 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+         100 /var/lib/dpkg/status
+ iproute:
+   Installed: 1:4.3.0-1ubuntu3.16.04.4
+   Candidate: 1:4.3.0-1ubuntu3.16.04.4
+   Version table:
+  *** 1:4.3.0-1ubuntu3.16.04.4 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
+         500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/main i386 
Packages
+         100 /var/lib/dpkg/status
+      1:4.3.0-1ubuntu3 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main i386 Packages
+ libavahi-compat-libdnssd1:
+   Installed: 0.6.32~rc+dfsg-1ubuntu2.3
+   Candidate: 0.6.32~rc+dfsg-1ubuntu2.3
+   Version table:
+  *** 0.6.32~rc+dfsg-1ubuntu2.3 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
+         500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
+         100 /var/lib/dpkg/status
+      0.6.32~rc+dfsg-1ubuntu2 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+ libqpdf17:
+   Installed: 6.0.0-2
+   Candidate: 6.0.0-2
+   Version table:
+  *** 6.0.0-2 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+         100 /var/lib/dpkg/status
+ libqmi-glib1:
+   Installed: 1.12.6-1
+   Candidate: 1.12.6-1
+   Version table:
+  *** 1.12.6-1 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+         100 /var/lib/dpkg/status
+ libproxy1-plugin-gsettings:
+   Installed: 0.4.11-5ubuntu1
+   Candidate: 0.4.11-5ubuntu1
+   Version table:
+  *** 0.4.11-5ubuntu1 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+         100 /var/lib/dpkg/status
+ libproxy1-plugin-networkmanager:
+   Installed: 0.4.11-5ubuntu1
+   Candidate: 0.4.11-5ubuntu1
+   Version table:
+  *** 0.4.11-5ubuntu1 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+         100 /var/lib/dpkg/status
+ ubuntu-core-launcher:
+   Installed: 2.37.4ubuntu0.1
+   Candidate: 2.37.4ubuntu0.1
+   Version table:
+  *** 2.37.4ubuntu0.1 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
+         500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
+         100 /var/lib/dpkg/status
+      1.0.27 500
+         500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+ 
+ ```
+ 
+ 
+ 3. Ubuntu 18.04 LTS - both programs report that `libllvm6.0` is orphan, but 
this is not true:
+ 
+ ```
+ $ apt-cache policy libllvm6.0
+ libllvm6.0:
+   Installed: 1:6.0-1ubuntu2
+   Candidate: 1:6.0-1ubuntu2
+   Version table:
+  *** 1:6.0-1ubuntu2 500
+         500 http://ru.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
+         100 /var/lib/dpkg/status
+ 
+ ```
+ 
+ 
+ Note: also seen on AskUbuntu ( https://askubuntu.com/q/1133811/66509 )
+ 
+ 
+ Original description is below:
+ --------
+ 
+ 
  $ apt install libsane-extras
  $ deborphan
  libsane-extras:amd64
  $
  
  a package explicitly installed by a user cannot be an orphan

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https://bugs.launchpad.net/bugs/1820906

Title:
  deborphan reports an explicitly installed package as an orphan

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