diff --git a/doc/docker/fpm/Dockerfile b/doc/docker/fpm/Dockerfile
index 7eee36c4a2..b2280fc5f0 100644
--- a/doc/docker/fpm/Dockerfile
+++ b/doc/docker/fpm/Dockerfile
@@ -3,7 +3,7 @@
 ## EGroupware FPM container using Ubuntu 18.04 and PHP 7.3 from ondrej/php PPA
 ##
 ################################################################################
-FROM ubuntu:22.04
+FROM ubuntu:20.04
 MAINTAINER rb@egroupware.org
 
 ARG VERSION=dev-master
@@ -78,7 +78,7 @@ exit $RESULT' \
 	&& rm -f /usr/local/bin/composer.phar
 RUN cd /usr/share/egroupware \
     # install nodejs 16.x PPA (Shoelace requires >= 14.17, Ubuntu 22.04 only has 12.x)
-    && curl -fsSL https://deb.nodesource.com/setup_16.x | bash - && apt update \
+    && curl -fsSL https://deb.nodesource.com/setup_16.x | bash - \
     && apt-get install -y nodejs \
 	&& npm install -g grunt-cli \
 	&& npm install \
@@ -104,7 +104,7 @@ RUN cd /usr/share/egroupware \
 	&& sed 's/apache/www-data/' doc/rpm-build/egroupware.cron > /etc/cron.d/egroupware \
 	&& patch -p1 < doc/rpm-build/asyncservice.patch
 	# disable certificate checks for LDAP as most LDAP and AD servers have no "valid" cert
-RUN ls /etc/ldap/ldap.conf || apt-get install -y libldap-common \
+RUN ls /etc/ldap/ldap.conf >/dev/null 2>&1 || apt-get install -y libldap-common \
     && echo "TLS_REQCERT never" >> /etc/ldap/ldap.conf \
 	# mv sources to a different directory so entrypoint can rsync them to volumn for both nginx and fpm
 	&& mv /usr/share/egroupware /usr/share/egroupware-sources
diff --git a/doc/docker/fpm/build.sh b/doc/docker/fpm/build.sh
index a13236fcb7..c29912735c 100755
--- a/doc/docker/fpm/build.sh
+++ b/doc/docker/fpm/build.sh
@@ -31,7 +31,7 @@ BRANCH=$(echo $VERSION|sed 's/\.[0-9]\{8\}$//')
 # add PHP_VERSION to TAG, if not the default PHP version
 [ $PHP_VERSION != $DEFAULT_PHP_VERSION ] && TAG=$TAG-$PHP_VERSION
 
-docker pull ubuntu:22.04
+docker pull ubuntu:20.04
 docker build --build-arg "VERSION=$VERSION" --build-arg "PHP_VERSION=$PHP_VERSION" -t egroupware/egroupware:$TAG . && {
 	docker push egroupware/egroupware:$TAG
 	# further tags are only for the default PHP version
diff --git a/doc/docker/fpm/entrypoint.sh b/doc/docker/fpm/entrypoint.sh
index 465abe72f5..07e15bb1d3 100755
--- a/doc/docker/fpm/entrypoint.sh
+++ b/doc/docker/fpm/entrypoint.sh
@@ -62,7 +62,7 @@ chmod 600 $LOG
 # run rollup / npm run build, to include extra apps JS in rollup build
 ls /usr/share/egroupware-extra/*/js >/dev/null 2>&1 && {
   cd /usr/share/egroupware
-#exit  npm run build
+  npm run build
 }
 
 max_retries=10
@@ -102,7 +102,6 @@ for f in /etc/crontab /etc/cron.*/*; do
   }
 done
 # to run async jobs
-#service cron start
-/etc/init.d/cron start
+service cron start
 
 exec "$@"
\ No newline at end of file