When trying to install libgrpc29 (rebuilt on bullseye for fasttrack.debian.net), it has some conflicts with libgrpc22. Unpacking libgrpc29:amd64 (1.51.1-3~fto11+1) ... dpkg: error processing archive /var/cache/apt/archives/libgrpc29_1.51.1-3~fto11+1_am d64.deb (--unpack): trying to overwrite '/usr/share/grpc/roots.pem', which is also in package libgrpc22 :amd64 1.44.0-2~fto11+1 dpkg-deb: error: paste subprocess was killed by signal (Broken pipe) Errors were encountered while processing: /var/cache/apt/archives/libgrpc29_1.51.1-3~fto11+1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) I think a good idea would be to move /usr/share/grpc/roots.pem to grpc-common package and libgrpc* depend on it. This will avoid conflicts on updates.