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After this operation, 0 B of additional disk space will be used.
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Preparing to replace libc6 2.15-0ubuntu10.12 (using .../libc6_2.15-0ubuntu10.12_amd64.deb) ...

A copy of the C library was found in an unexpected directory:
  '/lib/x86_64-linux-gnu/libdl-2.15.so'
It is not safe to upgrade the C library in this situation;
please remove that copy of the C library or get it out of
'/lib/x86_64-linux-gnu' and try again.

dpkg: error processing /var/cache/apt/archives/libc6_2.15-0ubuntu10.12_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/libc6_2.15-0ubuntu10.12_amd64.deb
localepurge: Disk space freed in /usr/share/locale: 0 KiB
localepurge: Disk space freed in /usr/share/man: 0 KiB

Total disk space freed by localepurge: 0 KiB