Your link named "here"
http://packages.ubuntu.com/karmic/libc6-udeb
( libc6-udeb , embedded glibc version 2.10 )
Quote :
"This package contains a minimal set of libraries needed for
the Debian installer.
Do not install it on a normal system."
( .. this is valid for all 'udeb' packages ... )
The package is for Ubuntu 9.10 Karmic, is that what you have ?
And why do you think, you need a package, normally only used
by the installer ? Providing files, you already have in /lib ?
'less libc6-udeb_2.10.1-0ubuntu8_i386.udeb' displays the files.
There may be another solution, if you tell, which software,
you are trying to install.
.....