diff --git a/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu1804.sh b/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu1804.sh
index de5d963dc2..0486ad6b29 100644
--- a/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu1804.sh
+++ b/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu1804.sh
@@ -16,7 +16,6 @@ apt-get install -y openjdk-11-jre
 # install dependencies
 
 # start-add-dependencies
-apt-get update
 apt-get -y install \
     unzip \
     wget \
diff --git a/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu2004.sh b/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu2004.sh
index 4330b067f2..f3bc0fd7b8 100644
--- a/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu2004.sh
+++ b/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu2004.sh
@@ -18,7 +18,6 @@ apt-get install -y openjdk-11-jre
 # install dependencies
 
 # start-add-dependencies
-apt-get update
 apt-get -y install \
     unzip \
     wget \
@@ -28,7 +27,6 @@ apt-get -y install \
 #end-step01
 # install Ice
 #start-recommended-ice
-apt-get update && \
 apt-get install -y -q \
 build-essential \
 db5.3-util \
@@ -52,7 +50,6 @@ ldconfig
 
 
 # install Postgres
-apt-get update
 apt-get -y install postgresql
 service postgresql start
 #end-step01
diff --git a/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu2204.sh b/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu2204.sh
index 06d69278c2..e3ab6b28a5 100644
--- a/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu2204.sh
+++ b/omero/sysadmins/unix/walkthrough/walkthrough_ubuntu2204.sh
@@ -18,7 +18,6 @@ apt-get install -y openjdk-11-jre
 # install dependencies
 
 # start-add-dependencies
-apt-get update
 apt-get -y install \
     unzip \
     wget \