Re: Problem with upgrading libc6

[Thorny <thorntreehome@gmail.com>]

On Mon, 16 Mar 2009 09:42:54 -0700, NFN Smith wrote:

[...]
> 
> Following this downgrade, libc6 (and related dependencies) are all still
> at etch versions.
>
>

This from Chapter 4 of the Lenny release notes may be of interest to you,
especially the part at the bottom since you are using Aptitude.

4.5.4. Upgrade apt and/or aptitude first

Several bug reports have shown that the versions of the aptitude and apt
packages in etch are often unable to handle the upgrade to lenny. In
lenny, apt is better at dealing with complex chains of packages requiring
immediate configuration and aptitude is smarter at searching for solutions
to satisfy the dependencies. These two features are heavily involved
during the dist-upgrade to lenny, so it is necessary to upgrade these two
packages before upgrading anything else. For apt, run:

# apt-get install apt

and for aptitude (if you have it installed) run:   

# aptitude install aptitude

This step will automatically upgrade libc6 and locales and will pull in
SELinux support libraries (libselinux1). At this point, some running
services will be restarted, including xdm, gdm and kdm. As a consequence,
local X11 sessions might be disconnected.