diff --git a/R/defaults.R b/R/defaults.R
index c3c0c51..6de2e6e 100644
--- a/R/defaults.R
+++ b/R/defaults.R
@@ -16,7 +16,7 @@
 
 .debian_platform <- "linux-x86_64-debian-gcc"
 .ubuntu_platform <- "linux-x86_64-ubuntu-gcc"
-.supported_platforms <- c(.debian_platform, .ubuntu_platform)
+.supported_platforms <- .debian_platform
 
 .init_config_file <- function() {
   tryCatch(
diff --git a/R/package-installation-methods.R b/R/package-installation-methods.R
index ea1c820..b4e1981 100644
--- a/R/package-installation-methods.R
+++ b/R/package-installation-methods.R
@@ -74,7 +74,7 @@ add_install_instructions <- function(base_dockerfile,
 
     # if platform is debian and system dependencies need to be installed, add the commands
     if (length(package_reqs) > 0) {
-      if (platform == .debian_platform || platform == .ubuntu_platform) {
+      if (platform == .debian_platform) {
         commands <- "export DEBIAN_FRONTEND=noninteractive; apt-get -y update"
         install_command <- paste("apt-get install -y",
                                  paste(package_reqs, collapse = " \\\n\t"))