Hi there
libc6 was already installed and up to date, but here is the apt-cache output.
I'm not sure what you mean about 64bit/32bit. I'm not in a position to install 32bit Debian as the box is my VPS and is also being used for live websites.
Package: libc6
Status: install ok installed
Priority: required
Section: libs
Installed-Size: 10230
Maintainer: GNU Libc Maintainers <debian-glibc@lists.debian.org>
Architecture: amd64
Multi-Arch: same
Source: glibc
Version: 2.21-0experimental0
Replaces: libc6-amd64
Depends: libgcc1
Suggests: glibc-doc, debconf | debconf-2.0, locales
Breaks: hurd (<< 1:0.5.git20140203-1), libtirpc1 (<< 0.2.3), locales (<< 2.21), locales-all (<< 2.21), lsb-core (<= 3.2-27), nscd (<< 2.21)
Conflicts: prelink (<= 0.0.20090311-1), tzdata (<< 2007k-1), tzdata-etch
Conffiles:
/etc/ld.so.conf.d/x86_64-linux-gnu.conf 593ad12389ab2b6f952e7ede67b8fbbf
Description-en: GNU C Library: Shared libraries
Contains the standard libraries that are used by nearly all programs on
the system. This package includes shared versions of the standard C library
and the standard math library, as well as many others.
Description-md5: fc3001b0b90a1c8e6690b283a619d57f
Homepage: http://www.gnu.org/software/libc/libc.html
Package: libc6
Source: glibc
Version: 2.19-18+deb8u10
Installed-Size: 10229
Maintainer: GNU Libc Maintainers <debian-glibc@lists.debian.org>
Architecture: amd64
Replaces: libc6-amd64
Depends: libgcc1
Suggests: glibc-doc, debconf | debconf-2.0, locales
Conflicts: prelink (<= 0.0.20090311-1), tzdata (<< 2007k-1), tzdata-etch
Breaks: hurd (<< 1:0.5.git20140203-1), libtirpc1 (<< 0.2.3), locales (<< 2.19), locales-all (<< 2.19), lsb-core (<= 3.2-27), nscd (<< 2.19)
Description-en: GNU C Library: Shared libraries
Contains the standard libraries that are used by nearly all programs on
the system. This package includes shared versions of the standard C library
and the standard math library, as well as many others.
Description-md5: fc3001b0b90a1c8e6690b283a619d57f
Multi-Arch: same
Homepage: http://www.gnu.org/software/libc/libc.html
Tag: implemented-in::c, role::shared-lib
Section: libs
Priority: required
Filename: pool/main/g/glibc/libc6_2.19-18+deb8u10_amd64.deb
Size: 4665056
MD5sum: ceb1786eb7ac7f18ee194fe68ebeeb98
SHA1: 47e3e6cebc6c23b444ec23ede306df825fc1dab2
SHA256: 0a95ee1c5bff7f73c1279b2b78f32d40da9025a76f93cb67c03f2867a7133e61