diff --git a/build-devel.sh b/build-devel.sh
index e37bf6870..d0188e9cf 100644
--- a/build-devel.sh
+++ b/build-devel.sh
@@ -17,7 +17,13 @@
 # this is a replica of ncp-update, but from devel branch
 install() 
 {
-  test -f /etc/apt/apt.conf.d/20nextcloudpi-upgrades && { echo "deactivate unattended upgrades first"; return 1; }
+  # wait for other apt processes
+  test -f /var/lib/apt/lists/lock && echo "waiting for apt processes to finish..." && \
+  while :; do
+    test -f /var/lib/apt/lists/lock && break
+    sleep 1
+  done
+
   echo -e "Downloading updates"
   rm -rf /tmp/ncp-update-tmp
   git clone --depth 20 -q -b devel https://github.com/nextcloud/nextcloudpi.git /tmp/ncp-update-tmp
diff --git a/buildlib.sh b/buildlib.sh
index 503c7572d..42352f7c0 100644
--- a/buildlib.sh
+++ b/buildlib.sh
@@ -143,22 +143,6 @@ function copy_to_image()
   rmdir tmpmnt &>/dev/null
 }
 
-function deactivate_unattended_upgrades()
-{
-  local IMG=$1
-  local SECTOR
-  local OFFSET
-  SECTOR=$( fdisk -l "$IMG" | grep Linux | awk '{ print $2 }' )
-  OFFSET=$(( SECTOR * 512 ))
-
-  [ -f "$IMG" ] || { echo "no image"; return 1; }
-  mkdir -p tmpmnt
-  sudo mount "$IMG" -o offset="$OFFSET" tmpmnt || return 1
-  sudo rm -f tmpmnt/etc/apt/apt.conf.d/20nextcloudpi-upgrades
-  sudo umount -l tmpmnt
-  rmdir tmpmnt &>/dev/null
-}
-
 function download_resize_raspbian_img()
 {
   local SIZE=$1
diff --git a/update.sh b/update.sh
index bbae59287..08d0af442 100755
--- a/update.sh
+++ b/update.sh
@@ -49,6 +49,10 @@ EXCL_DOCKER+="
 nc-update.sh
 nc-autoupdate-ncp.sh
 "
+
+# wait for other apt processes
+test -f /var/lib/apt/lists/lock && { echo "apt is currently running. Try again later";  exit 1; }
+
 cp etc/library.sh /usr/local/etc/
 
 source /usr/local/etc/library.sh