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[Juhani Numminen <juhaninumminen0@xxxxxxxxx>]

1/ To get LyX 2.1.5 in 16.04, I sent a message to #1595358 with the
debdiff. The package requires thorough testing but I'm not familiar with
lyx. Jean-Marc, could you please install lyx from
https://launchpad.net/~jsonic/+archive/ubuntu/ppa in a Ubuntu 16.04
system and check if all the functionality works?

2/ To upgrade 18.04 to 2.2.4 as a stable release update, we'd need
another debdiff, which I can try to provide as well.

4/ You can request a backport of LyX 2.3.0 to Ubuntu 18.04, using the
requestbackport tool. Details of the procedure:
https://wiki.ubuntu.com/UbuntuBackports.

Note that a 'backport' is different to a 'stable release update'. A
backport is only installed when the user specifically requests so, while
SRU gets pushed to all users of that Ubuntu version who have lyx
installed. As I understand it, upgrading the version from 2.2.3 to 2.3.0
is not allowed in a SRU because only micro-version updates are ok, see
https://wiki.ubuntu.com/StableReleaseUpdates.

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https://bugs.launchpad.net/bugs/1602145

Title:
  [needs-packaging] LyX version 2.2.x should go into LTS (maybe
  backported?)

Status in lyx package in Ubuntu:
  Incomplete

Bug description:
  As the LyX file format is often not compatible between different versions, and the 2.2.x release does not only bring several new features but also several fixes for crashs (see also bug #1595358), it would be nice to get LyX 2.2.x into the LTS version so that companies and universities with LTS installations can use the up to date, stable version.
  Additionally the LyX team announced, that the 2.1.5 will be the last in the 2.1.x series, so further changes to LyX file formats would soon not be supported/readable in Ubuntu any more, until 2021.

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