Public bug reported:

After upgrading to Yakkety and changed sources.list, aptitude is unable to 
retrieve packages changelogs.
It states an error message :

root@server:~$ aptitude changelog ubuntu-desktop
E: Cannot display changelog: Origin of ubuntu-desktop version 1.362 is unknown 
(maybe not an official Debian package; if it is, try to "update" package lists)

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: aptitude 0.8-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu4
Architecture: amd64
Date: Wed May 18 17:28:58 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-01-27 (477 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: aptitude
UpgradeStatus: Upgraded to yakkety on 2015-11-16 (184 days ago)

** Affects: aptitude (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug yakkety

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https://bugs.launchpad.net/bugs/1583226

Title:
  aptitude cannot display changelog : origin of $package is unknown

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