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1. Login into FileFlex Enterprise Server Administration page
2. Stop all servers except Administration and Storage Server
3. Perform Backup Now from Backup & Restore
4. Download the newly-created backup to your local storage
5. Depending on where your VM is hosted (VMWare Workstation, VirtualBox, HyperV, etc), go to its terminal and login the user sadmin

6. Type lsb_release -a.
   6.1. If it returns Ubuntu 18.04.3, go back to Server Administration page and press the Upgrade Machine button

   Distributor ID: Ubuntu Description:    Ubuntu 18.04.3 LTS Release:        18.04 Codename:       bionic

   6.2. If it returns Ubuntu 16.xx.xx you should manually upgrade OS through the terminal 

7. Run sudo mv /etc/apt/sources.list.d/ffs.list /etc/apt/sources.list.d/ffs.list.back to disable temporary fileflex repository 
8. Run sudo apt-get update
9. Run sudo apt dist-upgrade
   This will upgrade the OS system and all system packages to Ubuntu 16.04.7.During this step upgrade you might be asked to keep clamd package config
   Image Removed 
   Choose "keep the local version currently installed
   
10. NOTE: If you are upgrading Ubuntu OS on Oracle VirtualBox you may see the following: 

    

    Choose Y or I : install the package maintainer's version  for tools.conf

    
    During this step upgrade you might be asked to keep clamd package config
    Image Added 
    Choose "keep the local version currently installed
    Reboot the system when requested once the upgrade process completes.
11. If system reboot is not requested use the sudo reboot command
12. After system reboot, login to server console and type sudo do-release-upgrade --mode=server -f DistUpgradeViewNonInteractive 
    This command will upgrade system to new release 18.04. 
    During this step upgrade you might be asked to keep sysctl.conf file
    
    Type N or O
    
13. Run sudo reboot to restart the system
14.  Use the  lsb_release -a command to check the OS version. It should point to Release: 18.04.
    
15. Enable fileflex repository running sudo mv /etc/apt/sources.list.d/ffs.list.back /etc/apt/sources.list.d/ffs.list
16. Run  sudo apt-get update  
17. Load FileFlex Server Administration page
18. Press the Upgrade Machine button 

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