/usr/sbin/flash_eraseall is in mtd-utils 1:2.0.1-1ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
echo "${0##*/} has been replaced by \`flash_erase <mtddev> 0 0\`; please use it" 1>&2
[ $# -ne 0 ] && set -- "$@" 0 0
exec flash_erase "$@"
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