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Official documentation can be found at https://help.ubuntu.com/.
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See Kubuntu Help and Support. Download and use the PDF for the desired version.
Package Management
Disabling auto update
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APT::Periodic::Update-Package-Lists "0"; APT::Periodic::Unattended-Upgrade "0"; |
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It also may be necessary to do:
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# apt remove unattended-upgrades |
Switching version of major packages
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# apt autoremove
# reboot
# apt do-release-upgrade |
Troubleshooting
If something happens and you lose the terminal, try the steps at https://serverfault.com/a/427008.
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ssh <machine you're upgrading> # screen -list # screen -d -r root/2953.ubuntu-release-upgrade-screen-window |