You can easily upgrade over the network with the following procedure.
Click the Check button to check for new updates.
If there are any updates to install, use the Install Updates button to install them, and pressCheck again after that is complete.
Click Upgrade.
Install update-manager-core if it is not already installed:
sudo apt-get install update-manager-core
edit /etc/update-manager/release-upgrades and set Prompt=normal
Launch the upgrade tool:
sudo do-release-upgrade
Other upgrade options exist, please view the Upgrade Notes to learn more.
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