I am following the procedure on this web page:
https://www.phusionpassenger.com/library/install/apache/install/oss/jessie/More specifically, it says:
These commands will install Passenger + Apache module through
Phusion's APT repository.
# Install Phusion PGP key and add HTTPS support for APT
apt-key adv --keyserver hkp://
keyserver.ubuntu.com:80 --recv-keys 561F9B9CAC40B2F7
apt-get install -y apt-transport-https ca-certificates
...
However, I get an error that I didn't get about a week ago:
Sending build context to Docker daemon 16.9 kB
Step 1 : FROM ruby:2.3.2
---> d0f948bdaa95
Step 2 : RUN apt-get update && apt-get install -y sudo && apt-get install -y nodejs && apt-get install -y apache2 && rm -rf /var/lib/apt/lists/*
---> Using cache
---> 092546f22ee2
Step 3 : RUN apt-key adv --keyserver hkp://
keyserver.ubuntu.com:80 --recv-keys 561F9B9CAC40B2F7
---> Using cache
---> 93955013c221
Step 4 : RUN apt-get install -y apt-transport-https ca-certificates
---> Running in 3b9d5e3da049
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package apt-transport-https
The command '/bin/sh -c apt-get install -y apt-transport-https ca-certificates' returned a non-zero code: 100
Stein-Erik