Procedure
Log in to the Management Console.
On the TurboTier listing page, if the TurboTier OS version is older than Ubuntu 22.04, specifically Ubuntu 20.04, then you would observe a notification advising you to upgrade the TurboTier OS to Ubuntu 22.04. You can do this by following the steps listed in this section.
If the TurboTier OS is Ubuntu 22.04, you see the TurboTier as auto-upgradable and on clicking, it will begin to upgrade the TurboTier to R4 (R1 to R4, R2 to R4, and R3 to R4).
Steps to manually upgrade the operating system:
apt --fix-broken install -y
sudo DEBIAN_FRONTEND=noninteractive apt-get -y update && sudo DEBIAN_FRONTEND=noninteractive apt-get -y dist-upgrade
sed -i 's/Prompt=lts/Prompt=normal/g' /etc/update-manager/release-upgrades
rm /var/run/reboot-required.pkgs
do-release-upgrade -f DistUpgradeViewNonInteractive
reboot
## After reboot complete, check the OS with following command ##
cat /etc/os-release
## Output should have following values
PRETTY_NAME="Ubuntu 22.04.2 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.2 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy