Can't use apt-pinning (Hardy)

[Mumia W.]

Mumia W. wrote:
> I'm trying to use apt-pinning under Ubuntu Hardy i386 to prevent myself 
> from accidentally installing a buggy library; however, this does not work:
> 
> $ cd /etc/apt
> $ cat preferences
> Package: libimlib2
> Pin: version 1.4.0-1ubuntu1
> Pin-Priority: -10
> 
> $
> $ apt-cache policy libimlib2
> libimlib2:
>    Installed: (none)
>    Candidate: 1.4.0-1ubuntu1
>    Package pin: 1.4.0-1ubuntu1
>    Version table:
>       1.4.0-1ubuntu1 -10
>          500 http://us.archive.ubuntu.com hardy/main Packages
> $
> 
> Notice that the "-10" is in the wrong place. In Debian Etch's aptitude, 
> "-10" would be located where "500" is, but in Ubuntu Hardy's aptitude, 
> the default pin value of 500 is unchanged, and the "-10" shows up elsewhere.
> 
> Installs of libimlib2 are not prevented by aptitude:
> 
> $ aptitude -s install pypanel
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> Reading extended state information
> Initializing package states... Done
> Building tag database... Done
> The following packages have been automatically kept back:
>    linux-libc-dev
> The following NEW packages will be automatically installed:
>    libid3tag0 libimlib2 python-xlib
> The following packages have been kept back:
>    evolution evolution-common evolution-data-server
>    evolution-data-server-common evolution-plugins libssl0.9.8 openssl
> The following NEW packages will be installed:
>    libid3tag0 libimlib2 pypanel python-xlib
> 0 packages upgraded, 4 newly installed, 0 to remove and 8 not upgraded.
> Need to get 0B/411kB of archives. After unpacking 1700kB will be used.
> Do you want to continue? [Y/n/?]
> Would download/install/remove packages.
> $
> 
> If I didn't know what I was doing, I could've accidentally installed 
> libimlib2 (1.4.0-1ubuntu1) (exploitable). How can I get the pinning to work?
> 
> 

Can anyone help me get apt-pinning working as documented in 
apt_preferences (5)?