There is quite a simple solution to this problem: ln -sf ../proc/mounts mtab
Maybe this could be added to postinst or similar. Of course this only works when procfs is mounted to /proc, but is anyone really not doing this nowadays? The other advantage is that "mount" and "df" show the correct file systems even when "/" is mounted read-only, e. g. in single user mode. Cheers, - Stephan.
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