This feature was intentionally removed:
debconf (1.5.52) unstable; urgency=low
[Joey Hess]
* Remove dpkg-reconfigure -a, which existed only to accumulate bug
reports about bugs in other packages.
Closes: #721329, #664825, #558262, #617618, #707987
You can certainly use workarounds such as enumerating all other packages
and reconfiguring them individually, although it is not generally a
useful thing to do.
** Changed in: debconf (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1463672
Title:
-a and -all swith for dpkg-reconfigure do not work under 15.04
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