Upgrade Ubuntu Server

Upgrade Ubuntu Server

First become root:

sudo su

Then run

apt-get update

and install the package update-manager-core:

apt-get install update-manager-core

Open the file /etc/update-manager/release-upgrades...

vi /etc/update-manager/release-upgrades

... and change Prompt=lts to Prompt=normal:

[...] Prompt=normal

Then run

do-release-upgrade

to start the distribution upgrade.
Confirm that you want to do the upgrade:
Do you want to start the upgrade?

2 packages are going to be removed. 48 new packages are going to be
installed. 376 packages are going to be upgraded.

You have to download a total of 242M. This download will take about 6
minutes with your connection.

Fetching and installing the upgrade can take several hours. Once the
download has finished, the process cannot be cancelled.

Continue [yN] Details [d] <-- y
At the end of the upgrade process, you should remove obsolete packages:
Remove obsolete packages?

21 packages are going to be removed.

Continue [yN] Details [d] <-- y
The server needs to be rebooted to complete the upgrade:
System upgrade is complete.
Restart required
To finish the upgrade, a restart is required.
If you select 'y' the system will be restarted.
Continue [yN] <-- y
After the reboot, your server is running new Ubuntu.