[Koha] Upgrading from Koha 17.11 to 18.11 --- anything to watch out for?

[Chris Brown]

Hello,

We are currently running Koha 17.11 (installed from Debian packages) on
Debian 9.3, and we want to upgrade to Koha 18.11

Is it really as simple as:

sudo apt-get update
sudo apt-get upgrade

or is there anything else I need to watch out for? For example, do I need
to take action to update the database schema?

Best Regards,

Chris Brown