Install/Upgrade Ruby

wget https://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0.tar.gz
tar zxf ruby-2.1.0.tar.gz
cd ruby-2.1.0
./configure
make
make install

gem update --system
gem install bundler

Install skype on Ubuntu 18.04

Maybe remove previous install? You will need sudo password.
sudo snap remove skype
Then,
sudo snap install skype --classic

How to install AcidRip

Step 1

sudo apt-get update -y

Step 2

sudo apt-get install -y acidrip

Step 3

sudo apt-get install libdvdcss2

Step 4

There is no step 4

Source Link

Source Link

Source Link

How to install Audio Recorder in Ubuntu

1. Add the PPA

sudo add-apt-repository ppa:audio-recorder/ppa

2. Install

sudo apt update; sudo apt install audio-recorder

3. Remove

sudo apt remove audio-recorder