diff --git a/contrib/build-linux/appimage/Dockerfile b/contrib/build-linux/appimage/Dockerfile
index 5f43ac930..a20cebb9b 100644
--- a/contrib/build-linux/appimage/Dockerfile
+++ b/contrib/build-linux/appimage/Dockerfile
@@ -74,13 +74,13 @@ RUN apt-get update -q && \
     apt-get clean
 
 # create new user to avoid using root; but with sudo access and no password for convenience.
-ARG UID=1000
-RUN if [ "$UID" != "0" ] ; then useradd --uid $UID --create-home --shell /bin/bash "user" ; fi
-RUN usermod -append --groups sudo $(id -nu $UID || echo "user")
+# NOTE: UID *MUST* align with buildozer's Dockerfile "user"
+RUN useradd -u 1000 -m -s /usr/bin/bash -d /home/user user
+RUN usermod -aG sudo user
 RUN echo "%sudo ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
-RUN HOME_DIR=$(getent passwd $UID | cut -d: -f6)
-ENV WORK_DIR="${HOME_DIR}/wspace" \
-    PATH="${HOME_DIR}/.local/bin:${PATH}"
+ENV HOME_DIR=/home/user
+ENV WORK_DIR="${HOME_DIR}/wspace"
+ENV PATH="${HOME_DIR}/.local/bin:${PATH}"
 WORKDIR ${WORK_DIR}
-RUN chown --recursive ${UID} ${WORK_DIR}
-USER ${UID}
+RUN chown -R user ${WORK_DIR}
+USER user
diff --git a/contrib/build-linux/sdist/Dockerfile b/contrib/build-linux/sdist/Dockerfile
index 3b6f12112..4320eb577 100644
--- a/contrib/build-linux/sdist/Dockerfile
+++ b/contrib/build-linux/sdist/Dockerfile
@@ -17,13 +17,13 @@ RUN apt-get update -q && \
     apt-get clean
 
 # create new user to avoid using root; but with sudo access and no password for convenience.
-ARG UID=1000
-RUN if [ "$UID" != "0" ] ; then useradd --uid $UID --create-home --shell /bin/bash "user" ; fi
-RUN usermod -append --groups sudo $(id -nu $UID || echo "user")
+# NOTE: UID *MUST* align with buildozer's Dockerfile "user"
+RUN useradd -u 1000 -m -s /usr/bin/bash -d /home/user user
+RUN usermod -aG sudo user
 RUN echo "%sudo ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
-RUN HOME_DIR=$(getent passwd $UID | cut -d: -f6)
-ENV WORK_DIR="${HOME_DIR}/wspace" \
-    PATH="${HOME_DIR}/.local/bin:${PATH}"
+ENV HOME_DIR=/home/user
+ENV WORK_DIR="${HOME_DIR}/wspace"
+ENV PATH="${HOME_DIR}/.local/bin:${PATH}"
 WORKDIR ${WORK_DIR}
-RUN chown --recursive ${UID} ${WORK_DIR}
-USER ${UID}
+RUN chown -R user ${WORK_DIR}
+USER user
diff --git a/contrib/build-wine/Dockerfile b/contrib/build-wine/Dockerfile
index 4a7022bce..62d2ccd6c 100644
--- a/contrib/build-wine/Dockerfile
+++ b/contrib/build-wine/Dockerfile
@@ -57,16 +57,15 @@ RUN DEBIAN_CODENAME=$(lsb_release --codename --short) && \
     apt-get clean
 
 # create new user to avoid using root; but with sudo access and no password for convenience.
-ARG UID=1000
-RUN if [ "$UID" != "0" ] ; then useradd --uid $UID --create-home --shell /bin/bash "user" ; fi
-RUN usermod -append --groups sudo $(id -nu $UID || echo "user")
+# NOTE: UID *MUST* align with buildozer's Dockerfile "user"
+RUN useradd -u 1000 -m -s /usr/bin/bash -d /home/user user
+RUN usermod -aG sudo user
 RUN echo "%sudo ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
-RUN HOME_DIR=$(getent passwd $UID | cut -d: -f6)
-ENV WORK_DIR="${HOME_DIR}/wspace" \
-    PATH="${HOME_DIR}/.local/bin:${PATH}"
+ENV HOME_DIR=/home/user
+ENV WORK_DIR="${HOME_DIR}/wspace"
+ENV PATH="${HOME_DIR}/.local/bin:${PATH}"
 WORKDIR ${WORK_DIR}
-RUN chown --recursive ${UID} ${WORK_DIR}
-RUN chown ${UID} /opt
-USER ${UID}
+RUN chown -R user ${WORK_DIR} /opt
+USER user
 
 RUN mkdir --parents "/opt/wine64/drive_c/electrum"