package tcl-dev 8.6.0-0ubuntu1 failed to install/upgrade: trying to overwrite '/usr/lib/x86_64-linux-gnu/libtcl.so', which is also in package tcl-lib:amd64 8.6.0-0ubuntu1

[Anders Kaseorg]

Preparing to replace tcl-dev:amd64 8.6.0-0ubuntu1 (using .../tcl-dev_8.6.0+6_amd64.deb) ...
Unpacking replacement tcl-dev:amd64 ...
dpkg: error processing /var/cache/apt/archives/tcl-dev_8.6.0+6_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/libtcl.so', which is also in package tcl-lib:amd64 8.6.0-0ubuntu1

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: tcl-dev 8.6.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.12.0-7.15-generic 3.12.4
Uname: Linux 3.12.0-7-generic x86_64
NonfreeKernelModules: openafs
ApportVersion: 2.12.7-0ubuntu6
Architecture: amd64
Date: Wed Jan 8 22:06:41 2014
DuplicateSignature: package:tcl-dev:8.6.0-0ubuntu1:trying to overwrite '/usr/lib/x86_64-linux-gnu/libtcl.so', which is also in package tcl-lib:amd64 8.6.0-0ubuntu1
EcryptfsInUse: Yes
ErrorMessage: trying to overwrite '/usr/lib/x86_64-linux-gnu/libtcl.so', which is also in package tcl-lib:amd64 8.6.0-0ubuntu1
InstallationDate: Installed on 2010-12-05 (1130 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20101202)
SourcePackage: tcltk-defaults
Title: package tcl-dev 8.6.0-0ubuntu1 failed to install/upgrade: trying to overwrite '/usr/lib/x86_64-linux-gnu/libtcl.so', which is also in package tcl-lib:amd64 8.6.0-0ubuntu1
UpgradeStatus: Upgraded to trusty on 2013-10-31 (69 days ago)