Cannot install packages inside docker Ubuntu image

Question

I installed Ubuntu 14 04 image on docker  After that  when I try to install packages inside the ubuntu image  I m getting unable to locate package error    apt-get install curl  Reading package lists    Done Building dependency tree        Reading state information    Done E  Unable to locate package curl   How to fix this error

User · Answer

Add following command in Dockerfile   RUN apt-get update

User · Answer

Make sure you don t have any syntax errors in your Dockerfile as this can cause this error as well  A correct example is   RUN apt-get update        amp  amp  apt-get -y install curl       another-package   It was a combination of fixing a syntax error and adding apt-get update that solved the problem for me

User · Answer

You need to update the package list in your Ubuntu     sudo apt-get update   sudo apt-get install  lt package name gt

User · Answer

I found that mounting a local volume over  tmp can cause permission issues when the  apt-get update  runs  which prevents the package cache from being populated   Hopefully  this isn t something most people do  but it s something else to look for if you see this issue

User · Answer

It is because there is no package cache in the image  you need to run   apt-get update   before installing packages  and if your command is in a Dockerfile  you ll then need   apt-get -y install curl   To suppress the standard output from a command use -qq  E g   apt-get -qq -y install curl

User · Answer

From the docs in May 2017 2018 2019 2020     Always combine RUN apt-get update with apt-get install in the same   RUN statement  for example      RUN apt-get update  amp  amp  apt-get install -y package-bar                 Using apt-get update alone in a RUN statement causes caching   issues and subsequent apt-get install instructions fail                  Using RUN apt-get update  amp  amp  apt-get install -y ensures your Dockerfile installs the latest package versions with no further coding or manual intervention  This technique is known as    cache busting

[docker] Cannot install packages inside docker Ubuntu image

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