readbuffer
readbuffer/writebuffer: prevents tape drive seesawing, etc.
RUN apt-get update && \
apt-get install -y chiark-rwbuffer
RUN apt-get update && \
apt-get install -y chiark-rwbuffer
RUN apt-get update && \
apt-get install -y chiark-rwbuffer
RUN apt-get update && \
apt-get install -y chiark-rwbuffer