When trying to upgrade the OS of the Kerio Connect Virtual Appliance, the specific instructions should be followed. Kerio Virtual Appliance is based on Debian 8 installation. The recommended procedure consists of the upgrade from Debian 8 to Debian 9, and then to Debian 10.
Upgrade from Debian 8 to Debian 9 as per Upgrading Upgrading Kerio Connect on VMware guide (step 6)
Note: the full procedure about upgrading is available in Upgrades from Debian 9 guide.
- Create a Full Backup of the Kerio Connect Data.
- Open Kerio Connect Virtual Appliance (VA).
- Access the VA via SSH.
- Update the
source.listfile before performing the update: Run
deb http://ftp.us.debian.org/debian/ buster main
deb-src http://ftp.us.debian.org/debian/ buster main
deb http://security.debian.org/ buster/updates main
deb-src http://security.debian.org/ buster/updates main
# stretch-updates, previously known as 'volatile'
deb http://ftp.us.debian.org/debian/ buster-updates main
deb-src http://ftp.us.debian.org/debian/ buster-updates main
- Restart Kerio Connect.
To verify the OS version, run
lsb_release -a command and open the Kerio Connect Administration dashboard interface.