Control: found -1 1.13.0~pre2-1 and now we have the same problem with libgpr2-dev ... I assume you want to add a conflict against that, too. (Even if a conflict between two unrelated packages is not really the right solution here (one might want to link against both libraries), I don't see a better one here for now).
Selecting previously unselected package libgpr2-dev. Preparing to unpack .../38-libgpr2-dev_2018-1_amd64.deb ... Unpacking libgpr2-dev (2018-1) ... dpkg: error processing archive /tmp/apt-dpkg-install-xDppl5/38-libgpr2-dev_2018-1_amd64.deb (--unpack): trying to overwrite '/usr/lib/x86_64-linux-gnu/libgpr.a', which is also in package libgrpc-dev:amd64 1.13.0~pre2-1 dpkg-deb: error: paste subprocess was killed by signal (Broken pipe) Errors were encountered while processing: /tmp/apt-dpkg-install-xDppl5/38-libgpr2-dev_2018-1_amd64.deb Andreas
