In case there isn't a some better solution, here's a quick attempt at a
patch to the dmraid2mdadm.cfg script so that it only adds the keywords
to the value of GRUB_CMDLINE_LINUX_DEFAULT if it doesn't already contain
them.  That would at least prevent the command line from accumulating
any additional copies of the keywords during  later grub-pc package
upgrades.

This patch doesn't attempt to clean up already-existing extra copies of
the keywords in the line in the /etc/default/grub file.

Also, it only checks for cases where the keywords are found exactly as
they would have been added by this script; I don't know if those two
nomdmon* options are likely enough to have been added in some other
format that it's worth having this script check for them each
independently instead....

Nathan



** Patch added: "avoid adding keywords multiple times"
   
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1291434/+attachment/4162482/+files/dmraid2mdadm.cfg.patch

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https://bugs.launchpad.net/bugs/1291434

Title:
  GRUB_CMDLINE_LINUX_DEFAULT contains duplicate options

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