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For virtual machines or managed servers hosted by other providers, you should keep in mind that losing SSH connectivity is a risk, particularly if you don't have another means of remotely connecting to the system's console.For other systems under your control, remember that it's safest to perform major operating system upgrades only when you have direct physical access to the machine.For backup methods which will work on most Ubuntu systems, see How To Choose an Effective Backup Strategy for your VPS.Before beginning the release upgrade, it's safest to install the latest versions of all packages has not informed us of this, you can use the console available from the Digital Ocean Control Panel to connect to your Droplet without running SSH.Enter Your Password Progress (Will vary on the repositories you have enabled) sudo apt-get upgrade This will install almost all updates except some of the big things like kernel updates and things that may require you to restart the system after the change. If you however get something similar to "The following packages have been kept back: landscape-common linux-generic-pae linux-headers-generic-pae linux-image-generic-pae" you will need to run the dis-upgrade command and it will require a restart to have the changes applied.sudo apt-get dist-upgrade This command will allow you to apply a kernel upgrade or some big changes that will require a restart to take effect.
You can follow our series on how to migrate to a new Linux server to learn how to migrate between servers.
sudo apt-get update This will refresh the list of all available updates.
I would recommend running this before you run the upgrade commands to make sure you are getting all the available updates.
This guide assumes that you have a system running Ubuntu 15.10, configured with a non-root user with privileges for administrative tasks.
Although many systems can be upgraded in place without incident, it is often safer and more predictable to migrate to a major new release by installing the distribution from scratch, configuring services with careful testing along the way, and migrating application or user data as a separate step.
Comprehensive backups and extensive testing are strongly advised.