Looks like this has already been fixed. Code from natty:
./src/mountall.c: message = NIH_MUST (nih_strdup (NULL,
_("Your disk drives are being checked for errors. This may take some
time")));
** Changed in: mountall (Ubuntu)
Status: New => Fix Released
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** Package changed: plymouth (Ubuntu) => mountall (Ubuntu)
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https://bugs.launchpad.net/bugs/655985
Title:
Minor grammatical error in the "your disks are being checked" message
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ubun
** Attachment added: "A screenshot of the offending message."
https://bugs.launchpad.net/bugs/655985/+attachment/1675900/+files/ubuntucommasplice.png
** Attachment added: "BootDmesg.txt"
https://bugs.launchpad.net/bugs/655985/+attachment/1675901/+files/BootDmesg.txt
** Attachment added:
