It looks like this is the intended, though unintuitive behavior. If I
right-click on the 'Red' channel and choose 'Duplicate Channel', it
creates a fifth channel named 'Red Channel Copy' which does get listed
in the 'Add Layer Mask' window.

My understanding now is that the 'Red' channel is not actually a
channel, despite being called one.

** Changed in: gimp (Ubuntu)
       Status: Expired => Invalid

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https://bugs.launchpad.net/bugs/303029

Title:
  Initialize Layer Mask to: Channel drop-down box is grayed out.

Status in “gimp” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: gimp

  In the 'Add Layer Mask' dialog box, the drop-down box for selecting
  which channel to use is grayed out. If I choose the 'Channel' option
  and click the 'Add' button anyway, I get the message "Please select a
  channel first."

  GIMP 2.6.1, Ubuntu 8.10

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