title: What's the difference between libc6:i386 and libc6-i386
body: <p>I'm using <code>Ubuntu 14.04.2 LTS \n \l</code>.</p>
  
  <p>Here are the <code>libc</code>s I installed.</p>
  
  <pre><code>$ dpkg --list | grep libc6
  ii  libc6:amd64                                           2.19-0ubuntu6.7                                     amd64        Embedded GNU C Library: Shared libraries
  ii  libc6-dbg:amd64                                       2.19-0ubuntu6.7                                     amd64        Embedded GNU C Library: detached debugging symbols
  ii  libc6-dev:amd64                                       2.19-0ubuntu6.7                                     amd64        Embedded GNU C Library: Development Libraries and Header Files
  ii  libc6-i386                                            2.19-0ubuntu6.7                                     amd64        Embedded GNU C Library: 32-bit shared libraries for AMD64
  rc  libc6-x32                                             2.19-0ubuntu6.7                                     amd64        Embedded GNU C Library: X32 ABI Shared libraries for AMD64
  </code></pre>
  
  <p>But when I do <code>$ sudo apt-get install libdbus-1-3:i386</code></p>
  
  <p>The following errors show up</p>
  
  <pre><code>Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   libdbus-1-3:i386 : Depends: libc6:i386 (&gt;= 2.10) but it is not going to be installed
   unity-control-center : Depends: libcheese-gtk23 (&gt;= 3.4.0) but it is not going to be installed
                          Depends: libcheese7 (&gt;= 3.0.1) but it is not going to be installed
  E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
  </code></pre>
  
  <p>I'm wondering what's the difference between libc6:i386 and libc6-i386?</p>