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I noticed today that Ubuntu 12.04 will not include aufs.

What, if anything, will be available to facilitate the creation of union mounts?

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up vote 4 down vote accepted

The replacement for aufs in 12.04 is overlayfs.

In case you're interested, these sorts of things are decided at the "kernel delta review" and "kernel config review" sessions at each UDS. In this case, notes are at:

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