[Merge] ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/minimize-manual-LP-2036198 into livecd-rootfs:ubuntu/master

[Steve Langasek]

Review: Approve

The rename of the variable doesn't seem to make any bugs here more obvious - actually, doing the rename at the same time as fixing the use of the constant string made it harder for me to notice the functional change by diff inspection.  But this looks ok.
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https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/451438
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