diff --git a/.ci/test.sh b/.ci/test.sh
index cf3f51e3899a..e670e0c333e4 100755
--- a/.ci/test.sh
+++ b/.ci/test.sh
@@ -18,7 +18,7 @@ source activate $CONDA_ENV
 
 cd $BUILD_DIRECTORY
 
-if [[ $TRAVIS == "true" ]] && [[ $TASK == "check-docs" ]]; then
+if [[ $TASK == "check-docs" ]]; then
     cd $BUILD_DIRECTORY/docs
     conda install -q -y -n $CONDA_ENV -c conda-forge doxygen
     pip install --user -r requirements.txt rstcheck git+git://github.com/linkchecker/linkchecker.git@b9390c9ef63f7e1e210b48bc7fe97f76e8d39501
@@ -41,7 +41,7 @@ if [[ $TRAVIS == "true" ]] && [[ $TASK == "check-docs" ]]; then
     exit 0
 fi
 
-if [[ $TRAVIS == "true" ]] && [[ $TASK == "lint" ]]; then
+if [[ $TASK == "lint" ]]; then
     conda install -q -y -n $CONDA_ENV \
         pycodestyle \
         pydocstyle \
diff --git a/.travis.yml b/.travis.yml
index 930cc4d0f19e..42175ce71e55 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ git:
   depth: 5
 
 os:
-  - linux
+  # - linux
   - osx
 dist: focal
 osx_image: xcode12.2
@@ -20,8 +20,8 @@ env:
     - TASK=sdist
     - TASK=bdist
     - TASK=if-else
-    - TASK=lint
-    - TASK=check-docs
+    # - TASK=lint
+    # - TASK=check-docs
     - TASK=mpi METHOD=source
     - TASK=mpi METHOD=pip PYTHON_VERSION=3.7
     - TASK=mpi METHOD=wheel PYTHON_VERSION=3.7
@@ -37,10 +37,10 @@ matrix:
       env: TASK=gpu METHOD=pip PYTHON_VERSION=3.6
     - os: osx
       env: TASK=gpu METHOD=wheel PYTHON_VERSION=3.7
-    - os: osx
-      env: TASK=lint
-    - os: osx
-      env: TASK=check-docs
+    # - os: osx
+    #   env: TASK=lint
+    # - os: osx
+    #   env: TASK=check-docs
 
 before_install:
   - test -n $CC  && unset CC
diff --git a/.vsts-ci.yml b/.vsts-ci.yml
index d6e13e482cb9..eec6d4a1250f 100644
--- a/.vsts-ci.yml
+++ b/.vsts-ci.yml
@@ -20,8 +20,7 @@ jobs:
 ###########################################
   variables:
     COMPILER: gcc
-  pool:
-    vmImage: 'ubuntu-latest'
+  pool: sh-ubuntu
   container: ubuntu1404
   strategy:
     maxParallel: 6
@@ -42,6 +41,10 @@ jobs:
         TASK: gpu
         METHOD: source
         PYTHON_VERSION: 3.6
+      check_docs:
+        TASK: check-docs
+      lint:
+        TASK: lint
   steps:
   - script: |
       echo "##vso[task.setvariable variable=BUILD_DIRECTORY]$BUILD_SOURCESDIRECTORY"