enigmail 1.9.8 in Ubuntu 16.04

Mon Aug 28 09:58:03 UTC 2017

On Mon, 28 Aug 2017 09:01:19 +0200, Thomas Hungenberg wrote:
>There are incompatibility issues with enigmail 1.9.7 and newer versions
>of Thunderbird which cause Thunderbird to hang when sending mail.
>
>This has been fixed in Debian with an upgrade to enigmail version 1.9.8
>already some weeks ago.
>I wonder when enigmail 1.9.8 will be available in Ubuntu 16.04 LTS?

The short answer to your question is: Never!

The question should be what kinds of upgrades are provided for what
kind of Ubuntu release.

This would become a long answer, especial since it's unclear if you
even understand what the LTS release is. You are aware that
enigmail is from the universe repository? This is important, too.