package libc6-dev-i386 (not installed) failed to install/upgrade: tentata sovrascrittura di "/usr/include/bits" presente anche nel pacchetto libc6-dev-amd64 2.19-0ubuntu6.6

[Marco Pisano]

I've installed libc6-dev-amd64! So, i've installed g++-multilib. After 10 seconds it's showed me this error.
I don't know..

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: libc6-dev-i386 (not installed)
ProcVersionSignature: Ubuntu 3.16.0-31.43~14.04.1-generic 3.16.7-ckt5
Uname: Linux 3.16.0-31-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
Date: Wed Mar 18 15:17:51 2015
DuplicateSignature: package:libc6-dev-i386:(not installed):tentata sovrascrittura di "/usr/include/bits" presente anche nel pacchetto libc6-dev-amd64 2.19-0ubuntu6.6
ErrorMessage: tentata sovrascrittura di "/usr/include/bits" presente anche nel pacchetto libc6-dev-amd64 2.19-0ubuntu6.6
InstallationDate: Installed on 2015-03-17 (0 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: eglibc
Title: package libc6-dev-i386 (not installed) failed to install/upgrade: tentata sovrascrittura di "/usr/include/bits" presente anche nel pacchetto libc6-dev-amd64 2.19-0ubuntu6.6
UpgradeStatus: No upgrade log present (probably fresh install)