At this point unmount the image in the cloud control panel and then hit enter in the terminal.

Edit /etc/netplan/01-netcfg.yaml and add the following part:

network:
   version: 2
   renderer: networkd
   ethernets:
       ens3:
           addresses:
               - <ip6-address-copied-from-panel>::1/64
           dhcp4: true
           gateway6: fe80::1

After saving apply the netplan:

netplan apply

Now try to ping an ip outside of your box:

ping 1.1.1.1

Set volume as encrypted:

cryptsetup -y -v luksFormat /dev/sdb

Create random key for your volume and set proper permissions:

dd if=/dev/urandom of=/etc/volume-secret-key bs=512 count=8
chmod 0600 /etc/volume-secret-key

Add your key file to your volume as an ecryption key:

cryptsetup -v luksAddKey /dev/sdb /etc/volume-secret-key

To be able to automatically mount your encrypted volume you first need to get the UUID of your volume:

cryptsetup luksDump /dev/sdb | grep "UUID"

Now you need to edit /etc/crypttab and add the following entry for your volume:

volume UUID=3530a1c8-9de4-4c68-b674-9d9e88ab6e0d /etc/volume-secret-key luks

After doing that you are already able to start the encrypted volume:

cryptdisks_start volume

Install pv to see progress on the next step when clearing the volume:

apt-get update && apt-get install pv

Then clear the volume (this might take a few minutes depending on the size of the volume):

pv -tpreb /dev/zero | dd of=/dev/mapper/volume bs=128M

Now you can create the file system on top of the encrypted volume:

mkfs.ext4 /dev/mapper/volume

After that create a mount folder for the volume ...:

mkdir /mnt/volume

...and add the following line to /etc/fstab:

/dev/mapper/volume  /mnt/volume ext4    defaults    0   2

Now mount the encrypted volume with a swift:

mount -a

Install nextcloud and enable removable media:

snap install nextcloud
snap enable nextcloud
snap connect nextcloud:removable-media

Create a new data folder on your volume:

mkdir /mnt/volume/nextcloud

Update the config for nextcloud to use that new folder:

    nano /var/snap/nextcloud/current/nextcloud/config/config.php

Disable nextcloud, move over all files, if there are already any and enable it again:

snap disable nextcloud
mv /var/snap/nextcloud/common/nextcloud/data/* /mnt/volume/nextcloud
snap enable nextcloud

For further configuration visit https://manandkeyboard.tk/2018/01/07/nextcloud-snap-installation/

After that you can open up your browser and navigate to your server's ip: