diff --git a/contrib/android/Dockerfile b/contrib/android/Dockerfile
index 71ac55172..f24094f3b 100644
--- a/contrib/android/Dockerfile
+++ b/contrib/android/Dockerfile
@@ -94,11 +94,6 @@ RUN curl --location --progress-bar \
     && rm -rf "${APACHE_ANT_ARCHIVE}"
 
 
-ENV USER="user"
-ENV HOME_DIR="/home/${USER}"
-ENV WORK_DIR="${HOME_DIR}/wspace" \
-    PATH="${HOME_DIR}/.local/bin:${PATH}"
-
 # install system/build dependencies
 # https://github.com/kivy/buildozer/blob/master/docs/source/installation.rst#android-on-ubuntu-2004-64bit
 # TODO probably need to pin versions of at least some of these for over-time reproducibility?
@@ -136,17 +131,15 @@ RUN apt -y update -qq \
     && apt -y clean
 
 
-# prepare non root env
+# create new user to avoid using root; but with sudo access and no password for convenience.
+ENV USER="user"
+ENV HOME_DIR="/home/${USER}"
+ENV WORK_DIR="${HOME_DIR}/wspace" \
+    PATH="${HOME_DIR}/.local/bin:${PATH}"
 RUN useradd --create-home --shell /bin/bash ${USER}
-
-# with sudo access and no password
 RUN usermod -append --groups sudo ${USER}
 RUN echo "%sudo ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
-
-
 WORKDIR ${WORK_DIR}
-
-# user needs ownership/write access to these directories
 RUN chown --recursive ${USER} ${WORK_DIR} ${ANDROID_SDK_HOME}
 RUN chown ${USER} /opt
 USER ${USER}
diff --git a/contrib/android/build.sh b/contrib/android/build.sh
index 853b9b862..b102260f3 100755
--- a/contrib/android/build.sh
+++ b/contrib/android/build.sh
@@ -22,7 +22,7 @@ if [ ! -z "$ELECBUILD_NOCACHE" ] ; then
 fi
 
 info "building docker image."
-sudo docker build \
+docker build \
     $DOCKER_BUILD_FLAGS \
     -t electrum-android-builder-img \
     --file "$CONTRIB_ANDROID/Dockerfile" \
@@ -33,7 +33,7 @@ sudo docker build \
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then
     info "ELECBUILD_COMMIT=$ELECBUILD_COMMIT. doing fresh clone and git checkout."
     FRESH_CLONE="$CONTRIB_ANDROID/fresh_clone/electrum" && \
-        sudo rm -rf "$FRESH_CLONE" && \
+        rm -rf "$FRESH_CLONE" && \
         umask 0022 && \
         git clone "$PROJECT_ROOT" "$FRESH_CLONE" && \
         cd "$FRESH_CLONE"
@@ -51,7 +51,7 @@ fi
 
 info "building binary..."
 mkdir --parents "$PROJECT_ROOT_OR_FRESHCLONE_ROOT"/.buildozer/.gradle
-sudo docker run -it --rm \
+docker run -it --rm \
     --name electrum-android-builder-cont \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT":/home/user/wspace/electrum \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT"/.buildozer/.gradle:/home/user/.gradle \
@@ -63,5 +63,5 @@ sudo docker run -it --rm \
 # make sure resulting binary location is independent of fresh_clone
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then
     mkdir --parents "$DISTDIR/"
-    sudo cp -f "$FRESH_CLONE/dist"/* "$DISTDIR/"
+    cp -f "$FRESH_CLONE/dist"/* "$DISTDIR/"
 fi
diff --git a/contrib/build-linux/appimage/Dockerfile b/contrib/build-linux/appimage/Dockerfile
index 9ea6eb2ea..9884744a8 100644
--- a/contrib/build-linux/appimage/Dockerfile
+++ b/contrib/build-linux/appimage/Dockerfile
@@ -56,3 +56,15 @@ RUN apt-get update -q && \
     rm -rf /var/lib/apt/lists/* && \
     apt-get autoremove -y && \
     apt-get clean
+
+# create new user to avoid using root; but with sudo access and no password for convenience.
+ENV USER="user"
+ENV HOME_DIR="/home/${USER}"
+ENV WORK_DIR="${HOME_DIR}/wspace" \
+    PATH="${HOME_DIR}/.local/bin:${PATH}"
+RUN useradd --create-home --shell /bin/bash ${USER}
+RUN usermod -append --groups sudo ${USER}
+RUN echo "%sudo ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+WORKDIR ${WORK_DIR}
+RUN chown --recursive ${USER} ${WORK_DIR}
+USER ${USER}
diff --git a/contrib/build-linux/appimage/build.sh b/contrib/build-linux/appimage/build.sh
index 65b361081..6f48142a2 100755
--- a/contrib/build-linux/appimage/build.sh
+++ b/contrib/build-linux/appimage/build.sh
@@ -22,7 +22,7 @@ if [ ! -z "$ELECBUILD_NOCACHE" ] ; then
 fi
 
 info "building docker image."
-sudo docker build \
+docker build \
     $DOCKER_BUILD_FLAGS \
     -t electrum-appimage-builder-img \
     "$CONTRIB_APPIMAGE"
@@ -31,7 +31,7 @@ sudo docker build \
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then
     info "ELECBUILD_COMMIT=$ELECBUILD_COMMIT. doing fresh clone and git checkout."
     FRESH_CLONE="$CONTRIB_APPIMAGE/fresh_clone/electrum" && \
-        sudo rm -rf "$FRESH_CLONE" && \
+        rm -rf "$FRESH_CLONE" && \
         umask 0022 && \
         git clone "$PROJECT_ROOT" "$FRESH_CLONE" && \
         cd "$FRESH_CLONE"
@@ -42,7 +42,7 @@ else
 fi
 
 info "building binary..."
-sudo docker run -it \
+docker run -it \
     --name electrum-appimage-builder-cont \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT":/opt/electrum \
     --rm \
@@ -53,5 +53,5 @@ sudo docker run -it \
 # make sure resulting binary location is independent of fresh_clone
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then
     mkdir --parents "$DISTDIR/"
-    sudo cp -f "$FRESH_CLONE/dist"/* "$DISTDIR/"
+    cp -f "$FRESH_CLONE/dist"/* "$DISTDIR/"
 fi
diff --git a/contrib/build-linux/sdist/Dockerfile b/contrib/build-linux/sdist/Dockerfile
index bf7d03850..028940dc8 100644
--- a/contrib/build-linux/sdist/Dockerfile
+++ b/contrib/build-linux/sdist/Dockerfile
@@ -16,3 +16,15 @@ RUN apt-get update -q && \
     rm -rf /var/lib/apt/lists/* && \
     apt-get autoremove -y && \
     apt-get clean
+
+# create new user to avoid using root; but with sudo access and no password for convenience.
+ENV USER="user"
+ENV HOME_DIR="/home/${USER}"
+ENV WORK_DIR="${HOME_DIR}/wspace" \
+    PATH="${HOME_DIR}/.local/bin:${PATH}"
+RUN useradd --create-home --shell /bin/bash ${USER}
+RUN usermod -append --groups sudo ${USER}
+RUN echo "%sudo ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+WORKDIR ${WORK_DIR}
+RUN chown --recursive ${USER} ${WORK_DIR}
+USER ${USER}
diff --git a/contrib/build-linux/sdist/build.sh b/contrib/build-linux/sdist/build.sh
index 5f64c160e..ed969cbdf 100755
--- a/contrib/build-linux/sdist/build.sh
+++ b/contrib/build-linux/sdist/build.sh
@@ -22,7 +22,7 @@ if [ ! -z "$ELECBUILD_NOCACHE" ] ; then
 fi
 
 info "building docker image."
-sudo docker build \
+docker build \
     $DOCKER_BUILD_FLAGS \
     -t electrum-sdist-builder-img \
     "$CONTRIB_SDIST"
@@ -31,7 +31,7 @@ sudo docker build \
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then
     info "ELECBUILD_COMMIT=$ELECBUILD_COMMIT. doing fresh clone and git checkout."
     FRESH_CLONE="$CONTRIB_SDIST/fresh_clone/electrum" && \
-        sudo rm -rf "$FRESH_CLONE" && \
+        rm -rf "$FRESH_CLONE" && \
         umask 0022 && \
         git clone "$PROJECT_ROOT" "$FRESH_CLONE" && \
         cd "$FRESH_CLONE"
@@ -42,7 +42,7 @@ else
 fi
 
 info "building binary..."
-sudo docker run -it \
+docker run -it \
     --name electrum-sdist-builder-cont \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT":/opt/electrum \
     --rm \
@@ -53,5 +53,5 @@ sudo docker run -it \
 # make sure resulting binary location is independent of fresh_clone
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then
     mkdir --parents "$DISTDIR/"
-    sudo cp -f "$FRESH_CLONE/dist"/* "$DISTDIR/"
+    cp -f "$FRESH_CLONE/dist"/* "$DISTDIR/"
 fi
diff --git a/contrib/build-wine/Dockerfile b/contrib/build-wine/Dockerfile
index 9e66ee1fb..be3a9c1e9 100644
--- a/contrib/build-wine/Dockerfile
+++ b/contrib/build-wine/Dockerfile
@@ -53,3 +53,18 @@ RUN wget -nc https://dl.winehq.org/wine-builds/Release.key && \
     rm -rf /var/lib/apt/lists/* && \
     apt-get autoremove -y && \
     apt-get clean
+
+# create new user to avoid using root; but with sudo access and no password for convenience.
+ENV USER="user"
+ENV HOME_DIR="/home/${USER}"
+ENV WORK_DIR="${HOME_DIR}/wspace" \
+    PATH="${HOME_DIR}/.local/bin:${PATH}"
+RUN useradd --create-home --shell /bin/bash ${USER}
+RUN usermod -append --groups sudo ${USER}
+RUN echo "%sudo ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+WORKDIR ${WORK_DIR}
+RUN chown --recursive ${USER} ${WORK_DIR}
+RUN chown ${USER} /opt
+USER ${USER}
+
+RUN mkdir --parents "/opt/wine64/drive_c/electrum"
diff --git a/contrib/build-wine/build-electrum-git.sh b/contrib/build-wine/build-electrum-git.sh
index 1dbe1511d..3bfcbbd76 100755
--- a/contrib/build-wine/build-electrum-git.sh
+++ b/contrib/build-wine/build-electrum-git.sh
@@ -31,7 +31,7 @@ for i in ./locale/*; do
 done
 popd
 
-find -exec touch -d '2000-11-11T11:11:11+00:00' {} +
+find -exec touch -h -d '2000-11-11T11:11:11+00:00' {} +
 popd
 
 
@@ -60,7 +60,7 @@ wine "$WINE_PYHOME/scripts/pyinstaller.exe" --noconfirm --ascii --clean --name $
 
 # set timestamps in dist, in order to make the installer reproducible
 pushd dist
-find -exec touch -d '2000-11-11T11:11:11+00:00' {} +
+find -exec touch -h -d '2000-11-11T11:11:11+00:00' {} +
 popd
 
 info "building NSIS installer"
diff --git a/contrib/build-wine/build.sh b/contrib/build-wine/build.sh
index 48d21f3e4..3f7d3cb6f 100755
--- a/contrib/build-wine/build.sh
+++ b/contrib/build-wine/build.sh
@@ -21,7 +21,7 @@ if [ ! -z "$ELECBUILD_NOCACHE" ] ; then
 fi
 
 info "building docker image."
-sudo docker build \
+docker build \
     $DOCKER_BUILD_FLAGS \
     -t electrum-wine-builder-img \
     "$CONTRIB_WINE"
@@ -30,7 +30,7 @@ sudo docker build \
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then
     info "ELECBUILD_COMMIT=$ELECBUILD_COMMIT. doing fresh clone and git checkout."
     FRESH_CLONE="$CONTRIB_WINE/fresh_clone/electrum" && \
-        sudo rm -rf "$FRESH_CLONE" && \
+        rm -rf "$FRESH_CLONE" && \
         umask 0022 && \
         git clone "$PROJECT_ROOT" "$FRESH_CLONE" && \
         cd "$FRESH_CLONE"
@@ -41,7 +41,7 @@ else
 fi
 
 info "building binary..."
-sudo docker run -it \
+docker run -it \
     --name electrum-wine-builder-cont \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT":/opt/wine64/drive_c/electrum \
     --rm \
@@ -52,5 +52,5 @@ sudo docker run -it \
 # make sure resulting binary location is independent of fresh_clone
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then
     mkdir --parents "$PROJECT_ROOT/contrib/build-wine/dist/"
-    sudo cp -f "$FRESH_CLONE/contrib/build-wine/dist"/*.exe "$PROJECT_ROOT/contrib/build-wine/dist/"
+    cp -f "$FRESH_CLONE/contrib/build-wine/dist"/*.exe "$PROJECT_ROOT/contrib/build-wine/dist/"
 fi
diff --git a/contrib/build-wine/make_win.sh b/contrib/build-wine/make_win.sh
index c3448da84..18be42a7d 100755
--- a/contrib/build-wine/make_win.sh
+++ b/contrib/build-wine/make_win.sh
@@ -64,7 +64,7 @@ fi
 info "Resetting modification time in C:\Python..."
 # (Because of some bugs in pyinstaller)
 pushd /opt/wine64/drive_c/python*
-find -exec touch -d '2000-11-11T11:11:11+00:00' {} +
+find -exec touch -h -d '2000-11-11T11:11:11+00:00' {} +
 popd
 ls -l /opt/wine64/drive_c/python*
 
diff --git a/contrib/make_libusb.sh b/contrib/make_libusb.sh
index 20e3f27c3..6f4bcf4e7 100755
--- a/contrib/make_libusb.sh
+++ b/contrib/make_libusb.sh
@@ -48,7 +48,7 @@ info "Building $pkgname..."
             || fail "Could not configure $pkgname. Please make sure you have a C compiler installed and try again."
     fi
     make -j4 || fail "Could not build $pkgname"
-    make install || fail "Could not install $pkgname"
+    make install || warn "Could not install $pkgname"
     . "$here/$pkgname/libusb/.libs/libusb-1.0.la"
     host_strip "$here/$pkgname/libusb/.libs/$dlname"
     TARGET_NAME="$dlname"