Debian dropped aufs support from their kernel package. The way
forward is usage of overlayfs, now let's see whether we need
aufs-tools at all nowadays. Not being present in Debian/testing
currently fails the build because of aptitude's behavior change
with 0.7.6 where packages that can't be installed break
installations (see #835372). And aufs-tools probably won't appear
in Debian/testing soonish, given:
| % grep-excuses aufs-tools
| aufs-tools (- to 1:3.2+
20130722-1.1)
| Maintainer: Filesystems Group
| 976 days old (needed 5 days)
| aufs-tools has new bugs!
| Updating aufs-tools introduces new bugs: #788513
| Not considered