diff -Nru slick-greeter-1.1.4/debian/changelog slick-greeter-1.1.4/debian/changelog
--- slick-greeter-1.1.4/debian/changelog	2018-02-17 22:33:15.000000000 +0000
+++ slick-greeter-1.1.4/debian/changelog	2020-11-05 10:07:31.000000000 +0000
@@ -1,3 +1,11 @@
+slick-greeter (1.1.4-1ubuntu0.18.04.1) bionic; urgency=medium
+
+  * debian/patches/git-new-systemd.patch:
+    - remove a memory protection call which is leading to the greeter to
+      error out with the new systemd (lp: #1902879)
+
+ -- Sebastien Bacher <seb128@ubuntu.com>  Thu, 05 Nov 2020 11:07:31 +0100
+
 slick-greeter (1.1.4-1) unstable; urgency=medium
 
   * New upstream release
diff -Nru slick-greeter-1.1.4/debian/patches/git-new-systemd.patch slick-greeter-1.1.4/debian/patches/git-new-systemd.patch
--- slick-greeter-1.1.4/debian/patches/git-new-systemd.patch	1970-01-01 00:00:00.000000000 +0000
+++ slick-greeter-1.1.4/debian/patches/git-new-systemd.patch	2020-11-05 10:07:31.000000000 +0000
@@ -0,0 +1,46 @@
+From f9af95ea3f71511980438b80c85ea2bd19500f99 Mon Sep 17 00:00:00 2001
+From: Leigh Scott <leigh123linux@fedoraproject.org>
+Date: Wed, 20 Feb 2019 10:40:36 +0000
+Subject: [PATCH] remove mlockall (#127)
+
+---
+ src/slick-greeter.vala | 26 ++++++++++++++++++++++++--
+ 1 file changed, 24 insertions(+), 2 deletions(-)
+
+Index: slick-greeter-1.1.4/src/slick-greeter.vala
+===================================================================
+--- slick-greeter-1.1.4.orig/src/slick-greeter.vala
++++ slick-greeter-1.1.4/src/slick-greeter.vala
+@@ -543,8 +543,30 @@ public class SlickGreeter
+ 
+     public static int main (string[] args)
+     {
+-        /* Protect memory from being paged to disk, as we deal with passwords */
+-        Posix.mlockall (Posix.MCL_CURRENT | Posix.MCL_FUTURE);
++        /* Protect memory from being paged to disk, as we deal with passwords 
++
++           According to systemd-dev,
++
++           "mlockall() is generally a bad idea and certainly has no place in a graphical program. 
++           A program like this uses lots of memory and it is crucial that this memory can be paged 
++           out to relieve memory pressure."
++
++           With systemd version 239 the ulimit for RLIMIT_MEMLOCK was set to 16 MiB 
++           and therefore the mlockall call would fail. This is lucky becasue the subsequent mmap would not fail.
++
++           With systemd version 240 the RLIMIT_MEMLOCK is now set to 64 MiB 
++           and now the mlockall no longer fails. However, it not possible to mmap in all 
++           the memory and because that would still exceed the MEMLOCK limit.
++           "
++           See https://bugzilla.redhat.com/show_bug.cgi?id=1662857 &
++           https://github.com/CanonicalLtd/lightdm/issues/55    
++
++           RLIMIT_MEMLOCK = 64 MiB means, slick-greeter will most likely fail with 64 bit and
++           will always fail on 32 bit systems. 
++
++           Hence we better disable it. */
++
++        /*Posix.mlockall (Posix.MCL_CURRENT | Posix.MCL_FUTURE);*/
+ 
+         /* Disable global menubar */
+         Environment.unset_variable ("UBUNTU_MENUPROXY");
diff -Nru slick-greeter-1.1.4/debian/patches/series slick-greeter-1.1.4/debian/patches/series
--- slick-greeter-1.1.4/debian/patches/series	2018-02-17 22:33:15.000000000 +0000
+++ slick-greeter-1.1.4/debian/patches/series	2020-11-05 10:07:22.000000000 +0000
@@ -1,2 +1,3 @@
 sans-schema-font.patch
 mint-master-unstable-19.patch
+git-new-systemd.patch