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I have followed below steps to install Ruby1.9.1 on ubuntu 18.04 but it is showing latest ubuntu version after installation:

Steps:

sudo apt-get install ruby1.9.1-full

sudo apt-get install rubygems1.9.1

sudo apt-get install ruby1.9.1-dev

sudo update-alternatives --install /usr/bin/ruby ruby /usr/bin/ruby1.9.1 1

Response:

Reading package lists... Done

Building dependency tree

Reading state information... Done

E: Unable to locate package ruby1.9.1-full

E: Couldn't find any package by glob 'ruby1.9.1-full'

E: Couldn't find any package by regex 'ruby1.9.1-full'

Ruby apt-get installation failed, make sure that apt is working correctly and try again

./install_opentest.sh: line 135: break: only meaningful in a `for', `while', or `until' loop

Reading package lists... Done

Building dependency tree

Reading state information... Done

E: Unable to locate package rubygems1.9.1

E: Couldn't find any package by glob 'rubygems1.9.1'

E: Couldn't find any package by regex 'rubygems1.9.1'

rubygems apt-get installation failed, make sure that apt is working correctly and try again

./install_opentest.sh: line 135: break: only meaningful in a `for', `while', or `until' loop

Reading package lists... Done

Building dependency tree

Reading state information... Done

E: Unable to locate package ruby1.9.1-dev

E: Couldn't find any package by glob 'ruby1.9.1-dev'

E: Couldn't find any package by regex 'ruby1.9.1-dev'

Is it possible to install ruby1.9.1 on Ubuntu 18.04?

According to search on http://packages.ubuntu.com Ruby 1.9.1 is available only for Ubuntu 14.04 LTS.

According to official Ruby Maintenance Branches page 1.9.3 (as also 2.0.0, 2.1, 2.2) is EOL.

Consider to install supported version of Ruby 2.5.1 for your Ubuntu 18.04 LTS:

sudo apt install ruby2.5 ruby2.5-dev

If you really need to install 1.9.1 - then compile it manually. But make sure that you want to use end-of-life and insecure version.