Preparing to replace tk 8.6.0-0ubuntu1 (using .../archives/tk_8.6.0+6_amd64.deb) ...
update-alternatives: using /usr/bin/wish8.5 to provide /usr/bin/wish (wish) in auto mode
Unpacking replacement tk ...
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