diff --git a/build/linux-stable b/build/linux-stable
index 28167d9..c04aba6 160000
--- a/build/linux-stable
+++ b/build/linux-stable
@@ -1 +1 @@
-Subproject commit 28167d98f121e6daf20ee5d182e8cfbd2b90ec71
+Subproject commit c04aba6ee8e97492b1929b7b4f59e43da56e3781
diff --git a/build_scripts/build_kernel.sh b/build_scripts/build_kernel.sh
index c1b51a9..0894c57 100644
--- a/build_scripts/build_kernel.sh
+++ b/build_scripts/build_kernel.sh
@@ -22,8 +22,8 @@ kernel_do_compile() {
   local CHECK_DTBS=(
     renesas/r9a07g044c2-hummingboard-ripple.dtb
   )
-  : $(CROSS_COMPILE=${CROSS_TOOLCHAIN} ARCH=arm64 make O="${BUILDDIR_TMP_KERNEL}" -j "${MAKE_JOBS}" dt_binding_check || true)
-  CROSS_COMPILE=${CROSS_TOOLCHAIN} ARCH=arm64 make O="${BUILDDIR_TMP_KERNEL}" -j "${MAKE_JOBS}" CHECK_DTBS=y ${CHECK_DTBS[@]}
+  CROSS_COMPILE=${CROSS_TOOLCHAIN} ARCH=arm64 make O="${BUILDDIR_TMP_KERNEL}" -j "${MAKE_JOBS}" dt_binding_check || true
+  CROSS_COMPILE=${CROSS_TOOLCHAIN} ARCH=arm64 make O="${BUILDDIR_TMP_KERNEL}" -j "${MAKE_JOBS}" CHECK_DTBS=y ${CHECK_DTBS[@]} || true
   CROSS_COMPILE=${CROSS_TOOLCHAIN} ARCH=arm64 make O="${BUILDDIR_TMP_KERNEL}" -j "${MAKE_JOBS}" Image Image.gz dtbs modules
 }
 
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 0a7abab..9a25af5 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -31,6 +31,9 @@ RUN pipx install dtschema
 RUN ln -sv libncursesw.so.6 /usr/lib/x86_64-linux-gnu/libncursesw.so.5
 RUN ln -sv libtinfo.so.6 /usr/lib/x86_64-linux-gnu/libtinfo.so.5
 
+# delete default "ubuntu" user account, uid may conflict with entry script useradd
+RUN userdel -r ubuntu
+
 # build environment
 WORKDIR /work
 COPY shflags /