Preparing to replace mountall 2.48build1 (using .../mountall_2.49_amd64.deb) ...
Unpacking replacement mountall ...
Selecting previously unselected package libgc1c2:amd64.
Unpacking libgc1c2:amd64 (from .../libgc1c2_1%3a7.2d-4_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/libgc1c2_1%3a7.2d-4_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/libgccpp.so.1.0.3', which is also in package libgc1c3:amd64 1:7.2d-0ubuntu5