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Official documentation can be found at https://help.ubuntu.com/.

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Table of Contents

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See Kubuntu Help and Support. Download and use the PDF for the desired version.

Package Management

Code Block

title	/etc/apt/apt.conf.d/20auto-upgrades

APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Unattended-Upgrade "0";

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It also may be necessary to do:

Code Block
# apt remove unattended-upgrades

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Open and Ctrl+F in text editor

First, fully upgrade your existing installation:

Code Block
# apt update # apt upgrade

Expand

title	If ROS is installed...

Code Block
# apt remove ros-* # apt autoremove # rm /etc/apt/sources.list.d/ros-latest.list # apt update

Comment out any lines in ~/.bashrc that will try and source a nonexistent ROS installation.

Finally, remove unneeded stuff, reboot to make sure the system still boots, then do the release upgrade:

Code Block
# apt autoremove # reboot # apt do-release-upgrade

If something happens and you lose the terminal, try the steps at https://serverfault.com/a/427008.

Code Block
ssh <machine you're upgrading> # screen -list # screen -d -r root/2953.ubuntu-release-upgrade-screen-window