Preparing to replace tcl8.6 8.6.0-1ubuntu1 (using .../tcl8.6_8.6.1-4_amd64.deb) ...
Unpacking replacement tcl8.6 ...
Selecting previously unselected package libtcl8.6:amd64.
Unpacking libtcl8.6:amd64 (from .../libtcl8.6_8.6.1-4_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/libtcl8.6_8.6.1-4_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/libtcl8.6.so.0', which is also in package tcl8.6-lib:amd64 8.6.0-1ubuntu1
Preparing to replace tk8.6 8.6.0-1ubuntu1 (using .../tk8.6_8.6.1-3_amd64.deb) ...
Unpacking replacement tk8.6 ...
Selecting previously unselected package libtk8.6:amd64.
Unpacking libtk8.6:amd64 (from .../libtk8.6_8.6.1-3_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/libtk8.6_8.6.1-3_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/libtk8.6.so.0', which is also in package tk8.6-lib:amd64 8.6.0-1ubuntu1