CI: change apt to apt-get

.github/workflows/docs.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup tools
         run: |
           sudo sh -c "echo ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true | debconf-set-selections"
-          sudo apt update && sudo apt install -y calibre msttcorefonts
+          sudo apt-get update && sudo apt-get install -y calibre msttcorefonts
           npm install gitbook-cli -g
           gitbook fetch 3.2.3 && npm i npm@3.10.10 --prefix=~/.gitbook/versions/3.2.3/ # fixing https://travis-ci.org/github/CopterExpress/clover/jobs/766541125#L932
           npm install markdownlint-cli -g

builder/standalone-install.sh

@@ -3,8 +3,8 @@
 # Perform a "standalone install" in a Docker container
 set -e
 # Step 1: Install pip
-apt update
-apt install -y curl
+apt-get update
+apt-get install -y curl
 curl https://bootstrap.pypa.io/pip/2.7/get-pip.py -o get-pip.py
 python ./get-pip.py
 
@@ -21,7 +21,7 @@ led_msgs:
     stretch: ros-kinetic-led-msgs
     buster: ros-melodic-led-msgs
 EOF
-apt update
+apt-get update
 rosdep update
 
 # Step 2: Run rosdep to install all dependencies