Table of Contents

• apt-get update
• apt vs apt-get
• Install java8 with apt-get

apt-get update reference

When needed

E: Failed to fetch <uri>  404  Not Found [IP: <ip> 80]
E: Failed to fetch <uri>  404  Not Found [IP: <ip> 80]

When fails

• Check files in:

  /etc/apt/sources.list
  /etc/apt/sources.list.d/*.list
  

/var/lib/apt/lists/*

• Files for the list of packages, downloaded from Ubuntu servers.
• The size of the files is over MBs, people generally delete these files when building a Docker image.

apt vs apt-get discussion

The apt command is meant to be pleasant for end users and does not need to be backward compatible like apt-get(8).

Install java8 with apt-get howto

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

java -version
sudo apt-get install oracle-java8-set-default

sudo update-alternatives --config java