How to upgrade Ubuntu 18.04.x to Ubuntu 20.04 on Croissants

Ubuntu 20.04 LTS is released on April 23, 2020. It is recommended to upgrade to Ubuntu 20.04 LTS. You can upgrade Ubuntu 18.04.x to 20.04 on Croissants.

Ubuntu 18.04.x LTS will be End Of Life on April 2023 while Ubuntu 20.04 LTS will be End Of Life on April 2025. Meanwhile, Ubuntu 20.04 LTS is faster and generates lesser heat due to newer Linux kernel.

Connect the monitoring cable to the internet instead of switch. That means the Croissants is connected to the internet directly. To make sure you are connected to the internet, you can ping google.com -c1 to confirm.

Do not remote access to the Croissants. Carrying out the following procedure directly to the Croissants instead of SSH. If not, you may experience hanging at the end of the upgrade.

WARNING : Upgrade may fail and you may need to re-install Ubuntu 20.04 and Croissants when failed!!

sudo nano /etc/apt/sources.list.d/oisf-ubuntu-suricata-stable-bionic.list

Replace bionic with focal

sudo do-release-upgrade -d

Answer y to the questions when asked and select default answer when it is highlighted.

Reboot the box at the end of the upgrade.

When the box is rebooted, do the following procedure.

sudo nano /etc/apt/sources.list.d/oisf-ubuntu-suricata-stable-bionic.list

Remove # from # deb and replace bionic with focal when necessary.

sudo update_ubuntu
sudo apt remove libhyperscan4
sudo apt install --reinstall suricata 
sudo apt install ifupdown python3-pip
sudo pip3 install --upgrade suricata-update

Reconnect the monitoring cable back to the original position. Reboot the box again.

Samiux
OSCE OSCP OSWP
April 25, 2020, Hong Kong, China