[ci] fix locale-setting in jobs running in ubuntu container (#5643)

.ci/setup.sh

@@ -23,7 +23,7 @@ if [[ $OS_NAME == "macos" ]]; then
         -o miniforge.sh \
         https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-MacOSX-x86_64.sh
 else  # Linux
-    if [[ $IN_UBUNTU_LATEST_CONTAINER == "true" ]]; then
+    if [[ $IN_UBUNTU_BASE_CONTAINER == "true" ]]; then
         # fixes error "unable to initialize frontend: Dialog"
         # https://github.com/moby/moby/issues/27988#issuecomment-462809153
         echo 'debconf debconf/frontend select Noninteractive' | sudo debconf-set-selections
@@ -46,6 +46,7 @@ else  # Linux
             libssl-dev \
             libunwind8 \
             locales \
+            locales-all \
             netcat \
             unzip \
             zip || exit -1
@@ -56,16 +57,15 @@ else  # Linux
         fi
 
         export LANG="en_US.UTF-8"
+        sudo update-locale LANG=${LANG}
         export LC_ALL="${LANG}"
-        sudo locale-gen ${LANG}
-        sudo update-locale
     fi
     if [[ $TASK == "r-package" ]] && [[ $COMPILER == "clang" ]]; then
         sudo apt-get install --no-install-recommends -y \
             libomp-dev
     fi
     if [[ $TASK == "mpi" ]]; then
-        if [[ $IN_UBUNTU_LATEST_CONTAINER == "true" ]]; then
+        if [[ $IN_UBUNTU_BASE_CONTAINER == "true" ]]; then
             sudo apt-get update
             sudo apt-get install --no-install-recommends -y \
                 libopenmpi-dev \
@@ -78,7 +78,7 @@ else  # Linux
         fi
     fi
     if [[ $TASK == "gpu" ]]; then
-        if [[ $IN_UBUNTU_LATEST_CONTAINER == "true" ]]; then
+        if [[ $IN_UBUNTU_BASE_CONTAINER == "true" ]]; then
             sudo apt-get update
             sudo apt-get install --no-install-recommends -y \
                 libboost1.74-dev \
@@ -94,7 +94,7 @@ else  # Linux
         fi
     fi
     if [[ $TASK == "gpu" || $TASK == "bdist" ]]; then
-        if [[ $IN_UBUNTU_LATEST_CONTAINER == "true" ]]; then
+        if [[ $IN_UBUNTU_BASE_CONTAINER == "true" ]]; then
             sudo apt-get update
             sudo apt-get install --no-install-recommends -y \
                 pocl-opencl-icd

.ci/test.sh

@@ -8,6 +8,11 @@ elif [[ $OS_NAME == "linux" ]] && [[ $COMPILER == "clang" ]]; then
     export CC=clang
 fi
 
+if [[ $IN_UBUNTU_BASE_CONTAINER == "true" ]]; then
+    export LANG="en_US.UTF-8"
+    export LC_ALL="en_US.UTF-8"
+fi
+
 if [[ "${TASK}" == "r-package" ]] || [[ "${TASK}" == "r-rchk" ]]; then
     bash ${BUILD_DIRECTORY}/.ci/test_r_package.sh || exit -1
     exit 0

.vsts-ci.yml

@@ -84,7 +84,7 @@ jobs:
   variables:
     COMPILER: clang
     DEBIAN_FRONTEND: 'noninteractive'
-    IN_UBUNTU_LATEST_CONTAINER: 'true'
+    IN_UBUNTU_BASE_CONTAINER: 'true'
     OS_NAME: 'linux'
     SETUP_CONDA: 'true'
   pool: sh-ubuntu