I hit this bug as well during manual partitioning. You can repro it by manually running /lib/partman/display.d/80manual_partitioning, you should see a clobbered screen and then the process exits.
I hit this bug as well during manual partitioning. You can repro it by manually running /lib/partman/ display. d/80manual_ partitioning, you should see a clobbered screen and then the process exits.