[Bug 1248437] [NEW] downgrade not working, package is removed

[Stelian Galmati]

Public bug reported:

Having the following scenario:

Package: a
Status: install ok installed
Version: 2
Depends: b (>> 1)
Architecture: all

Package: b
Status: install ok installed
Version: 2
Architecture: all

Package: a
Version: 1
Depends: b (<< 2)
Architecture: all

Package: b
Version: 1
Architecture: all


If I want to mark_install a, version 1 then the package a, version 2 is marked for removal.
I would expect that a, version 2 and b, version 2 to be downgraded to version 1.

Tested on:
-------------------
Ubuntu 12.04 amd64
python-apt                                   0.8.3ubuntu7.1

Thanks

** Affects: python-apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1248437

Title:
  downgrade not working, package is removed

Status in “python-apt” package in Ubuntu:
  New

Bug description:
  Having the following scenario:

  Package: a
  Status: install ok installed
  Version: 2
  Depends: b (>> 1)
  Architecture: all

  Package: b
  Status: install ok installed
  Version: 2
  Architecture: all

  Package: a
  Version: 1
  Depends: b (<< 2)
  Architecture: all

  Package: b
  Version: 1
  Architecture: all

  
  If I want to mark_install a, version 1 then the package a, version 2 is marked for removal.
  I would expect that a, version 2 and b, version 2 to be downgraded to version 1.

  Tested on:
  -------------------
  Ubuntu 12.04 amd64
  python-apt                                   0.8.3ubuntu7.1

  Thanks

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