diff -Nru gap-sonata-2.9.1+ds/debian/changelog gap-sonata-2.9.1+ds/debian/changelog
--- gap-sonata-2.9.1+ds/debian/changelog	2019-10-01 20:02:52.000000000 +0000
+++ gap-sonata-2.9.1+ds/debian/changelog	2019-10-04 18:07:59.000000000 +0000
@@ -1,9 +1,14 @@
-gap-sonata (2.9.1+ds-2ubuntu1) eoan; urgency=medium
+gap-sonata (2.9.1+ds-3) unstable; urgency=medium
 
-  * Build-depend on texlive-plain-generic instead of obsolete texlive-
-    generic-recommended.
+  * RC fix release (Closes: #941521), build-dependency update.
+  * Debianization:
+    - debian/copyright:
+      - copyright fields, update;
+    - debian/control:
+      - debhelper, bump to 12;
+      - Standards Version, bump to 4.4.1 (no change).
 
- -- Steve Langasek <steve.langasek@ubuntu.com>  Tue, 01 Oct 2019 13:02:52 -0700
+ -- Jerome Benoit <calculus@rezozer.net>  Fri, 04 Oct 2019 18:07:59 +0000
 
 gap-sonata (2.9.1+ds-2) unstable; urgency=medium
 
diff -Nru gap-sonata-2.9.1+ds/debian/compat gap-sonata-2.9.1+ds/debian/compat
--- gap-sonata-2.9.1+ds/debian/compat	2018-11-14 06:45:07.000000000 +0000
+++ gap-sonata-2.9.1+ds/debian/compat	1970-01-01 00:00:00.000000000 +0000
@@ -1 +0,0 @@
-11
diff -Nru gap-sonata-2.9.1+ds/debian/control gap-sonata-2.9.1+ds/debian/control
--- gap-sonata-2.9.1+ds/debian/control	2019-10-01 20:02:52.000000000 +0000
+++ gap-sonata-2.9.1+ds/debian/control	2019-10-04 17:47:31.000000000 +0000
@@ -1,14 +1,13 @@
 Source: gap-sonata
 Section: math
 Priority: optional
-Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
-XSBC-Original-Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
+Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
 Uploaders: Jerome Benoit <calculus@rezozer.net>
 Build-Depends:
- debhelper (>= 11),
+ debhelper-compat (= 12),
  gap (>=4r9p3), gap-smallgrp, gap-autpgrp,
  texlive-plain-generic, texlive-fonts-recommended, tth
-Standards-Version: 4.2.1
+Standards-Version: 4.4.1
 Homepage: https://www.gap-system.org/Packages/sonata.html
 Vcs-Git: https://salsa.debian.org/science-team/gap-sonata.git
 Vcs-Browser: https://salsa.debian.org/science-team/gap-sonata
diff -Nru gap-sonata-2.9.1+ds/debian/copyright gap-sonata-2.9.1+ds/debian/copyright
--- gap-sonata-2.9.1+ds/debian/copyright	2018-11-14 08:48:54.000000000 +0000
+++ gap-sonata-2.9.1+ds/debian/copyright	2019-10-04 18:07:31.000000000 +0000
@@ -22,7 +22,7 @@
 
 Files: *
 Copyright:
- 2012-2018 the SONATA Team <sonata@algebra.uni-linz.ac.at>
+ 2012-2019 the SONATA Team <sonata@algebra.uni-linz.ac.at>
              Erhard Aichinger
              Franz Binder
              Jürgen Ecker
@@ -32,12 +32,12 @@
 
 Files: debian/*
 Copyright:
- 2016-2018 Jerome Benoit <calculus@rezozer.net>
+ 2016-2019 Jerome Benoit <calculus@rezozer.net>
 License: GPL-2+
 
 Files: debian/adhoc/doc/manual.mst
 Copyright:
- 1987-2018 GAP Group
+ 1987-2019 GAP Group
 License: GPL-2+
 Comment:
  Imported by hand from the previous version.