update for ubuntu software version

1. added key
wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null |sudo apt-key add -

2. added repository
U20:sudo apt-add-repository -r 'deb https://apt.kitware.com/ubuntu/ focal main'
U18:sudo apt-add-repository -r 'deb https://apt.kitware.com/ubuntu/ bionic main'

U20:sudo apt-add-repository -r 'deb https://apt.kitware.com/ubuntu/ focal-rc main'
U18:sudo apt-add-repository -r 'deb https://apt.kitware.com/ubuntu/ bionic-rc main'

3. update source list
sudo apt-get update

4. sudo apt install application=version

URI:https://apt.kitware.com/