After upgrading to 16.04, I tried to use that command, but it seems that
dpkg --reconfigure) doesn't understand the option
Is it still available? If not, is there an equivalent command?
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dpkg-reconfigure on 16.04 (but also on 15.10) does not have the option
--all any more, although it was present in 14.04 (not sure about 14.10).
You could have verified that yourself by checking the command's manpage:
On a 16.04 (or 15.10) system, this manual page will not list an
--all argument, while on 14.04 one is present.
If you don't have those systems at hand, just read the online manpages: 16.04 - 15.10 - 14.04
(note for future readers: if one of the linked releases has reached end-of-life by the time you read this, the link will redirect to the latest release's manpage instead of showing the old, archived version)