set ( self, debconf_info )
Setting debconf info is a bit tricky. There's a bug in
debconf-communicate where it doesn't always run right if you
pipe lots of debconf commands to it at once, so for safety's
sake, we need to send one command at a time. However, we
need to run it with privilege, and the privileged runner
interface doesn't provide a way to do pipes (yet). So, we
run a little shell script on the other side of the
privileged runner, piping a temp file into it.
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