diff --git a/ct/omada-v3.sh b/ct/omada-v3.sh
index dfe64bce..b0d264aa 100644
--- a/ct/omada-v3.sh
+++ b/ct/omada-v3.sh
@@ -310,7 +310,7 @@ pushd $TEMP_DIR >/dev/null
 
 export CTID=$CT_ID
 export PCT_OSTYPE=ubuntu
-export PCT_OSVERSION=20.04
+export PCT_OSVERSION=18.04
 export PCT_DISK_SIZE=$DISK_SIZE
 export PCT_OPTIONS="
   -features $FEATURES