upgrading dont care about locked package

Binary package hint: synaptic

Natty testing (i386 updated)

for my needs i've locked a package to a previous release. When i use either synaptic or update-manager and update, its ok they dont propose to update that locked package.
But in a terminal, if i run:

sudo apt-get install -f : it says 1 package non installed
sudo apt-get upgrade : the package is proposed for upgrading

So different upgrading tools give different results, confusing. In this case the problem is minor as i've only 1 recent locked package and i remind about it, but otherwise ... Dont know which package to blame.

 I think that these tools might clearly return the situation: do you want to upgrade the locked package ?

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: synaptic 0.70~pre2ubuntu1
ProcVersionSignature: Ubuntu 2.6.37-7.19-generic-pae 2.6.37-rc3
Uname: Linux 2.6.37-7-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Thu Dec 2 20:15:13 2010
ProcEnviron:
 LANG=fr_FR.utf8
 SHELL=/bin/bash
SourcePackage: synaptic