diff --git a/.github/workflows/java-cd.yml b/.github/workflows/java-cd.yml
index 7dd8d2e54c..1e11360bc7 100644
--- a/.github/workflows/java-cd.yml
+++ b/.github/workflows/java-cd.yml
@@ -253,7 +253,7 @@ jobs:
               id: port
               run: |
                   if ${{ matrix.host.OS == 'ubuntu'}}; then
-                      apt install net-tools
+                      sudo apt install net-tools
                       while
                         port=$(shuf -n 1 -i 40000-65000)
                         netstat -atun | grep -q "$port"
@@ -261,7 +261,7 @@ jobs:
                         continue
                       done
                   else
-                    comm -23 <(seq 49152 65535 | sort) <(awk '{print $4}' | cut -d':' -f2 | sort -u) | shuf | head -n 1 >> $port
+                    export port=`comm -23 <(seq 49152 65535 | sort) <(awk '{print $4}' | cut -d':' -f2 | sort -u) | shuf | head -n 1`
                   fi
 
                   echo "PORT=$port" >> $GITHUB_OUTPUT