diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -205,6 +205,8 @@
   docker-ubuntu-xenial-ppa \
   docker-ubuntu-bionic \
   docker-ubuntu-bionic-ppa \
+  docker-ubuntu-focal \
+  docker-ubuntu-focal-ppa \
   fedora \
   linux-wheels \
   linux-wheels-x86_64 \
diff --git a/contrib/packaging/Makefile b/contrib/packaging/Makefile
--- a/contrib/packaging/Makefile
+++ b/contrib/packaging/Makefile
@@ -9,7 +9,7 @@
   xenial \
   bionic \
   cosmic \
-  disco
+  focal
 
 FEDORA_RELEASE := 31
 
diff --git a/contrib/packaging/docker/ubuntu.template b/contrib/packaging/docker/ubuntu.template
--- a/contrib/packaging/docker/ubuntu.template
+++ b/contrib/packaging/docker/ubuntu.template
@@ -3,6 +3,10 @@
 RUN groupadd -g 1000 build && \
     useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
 
+ARG DEBIAN_FRONTEND=noninteractive
+
+ENV TZ=%TZ%
+
 RUN apt-get update && apt-get install -y \
   build-essential \
   debhelper \
diff --git a/contrib/packaging/dockerdeb b/contrib/packaging/dockerdeb
--- a/contrib/packaging/dockerdeb
+++ b/contrib/packaging/dockerdeb
@@ -12,10 +12,12 @@
 
 OUTPUTDIR=${OUTPUTDIR:=$ROOTDIR/packages/$PLATFORM}
 CONTAINER=hg-docker-$PLATFORM
+TZ=`ls -la /etc/localtime | cut -d/ -f7-9`
 
 DOCKER=$($BUILDDIR/hg-docker docker-path)
 
 $BUILDDIR/hg-docker build \
+    --build-arg TZ=$TZ \
     --build-arg CODENAME=$CODENAME \
     $BUILDDIR/docker/$DISTID.template \
     $CONTAINER