diff --git a/usr/lib/archboot/update-installer.sh b/usr/lib/archboot/update-installer.sh
index 8815adf24..f0d988e56 100644
--- a/usr/lib/archboot/update-installer.sh
+++ b/usr/lib/archboot/update-installer.sh
@@ -118,9 +118,20 @@ _clean_archboot() {
 }
 
 _gpg_check() {
+    # pacman-key process itself
     while pgrep -x pacman-key > /dev/null 2>&1; do
-        sleep 2
+        sleep 1
     done
+    # gpg finished in background
+    while pgrep -x gpg > /dev/null 2>&1; do
+        sleep 1
+    done
+    while true; do
+    # gpg-agent finished in background
+        [[ "$(pgrep -x gpg-agent -c)" == "2" ]] && break
+        sleep 1
+    done
+    while pgrep -x gpg-agent -c
     [[ "${_RUNNING_ARCH}" == "x86_64" ]] && systemctl stop pacman-init.service
     [[ "${_RUNNING_ARCH}" == "aarch64" ]] && systemctl stop pacman-init-arm.service
 }