# apt-get install auctex
Reading package lists... Done
Building dependency tree... Done
You might want to run ‘apt-get -f install’ to correct these:
The following packages have unmet dependencies.
  libc6-amd64: Depends: libc6 (= 2.3.6.ds1-13) but 2.3.6-7 is to be installed
  libc6-dev: Depends: libc6 (= 2.3.6.ds1-13) but 2.3.6-7 is to be installed
E: Unmet dependencies. Try ‘apt-get -f install’ with no packages (or specify a solution).

# apt-get -f install
Reading package lists... Done
Building dependency tree... Done
Correcting dependencies...Done
The following extra packages will be installed:
  libc6
Suggested packages:
  glibc-doc
The following packages will be upgraded:
  libc6
1 upgraded, 0 newly installed, 0 to remove and 755 not upgraded.
3 not fully installed or removed.
Need to get 0B/4700kB of archives.
After unpacking 115kB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
  libc6
Install these packages without verification [y/N]? y
(Reading database ... 119333 files and directories currently installed.)
Preparing to replace libc6 2.3.6-7 (using .../libc6_2.3.6.ds1-13_i386.deb) ...
Matching libraries: /usr/lib/libc.so.6

A copy of glibc was found in an unexpected directory.
It is not safe to upgrade the C library in this situation;
please remove that copy of the C library and try again.
dpkg: error processing /var/cache/apt/archives/libc6_2.3.6.ds1-13_i386.deb (--unpack):
 subprocess pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/libc6_2.3.6.ds1-13_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)