PEW

@gprovost I described last year a process to upgrade from omv4 to omv5. (which is doable). I also did a clean install of omv5 after i was having random reboot issues using the newer kernel5. 
I ended up using the clean built and reconfiguring all the services and dockers. I do not recommend using the newer kernel if you are using dockers. This is where I would have random system reboots. OMV4 was very stable but since omv4 was eol. I decided to upgrade or do a clean install. I did both with the same random reboots using the newer kernel 5. Once i switched back to the older kernel with my config, I was not having the random reboot issues. I understand this would be hard to replica because everyone has different configs. I am just trying to help anyone else that would be in this situation.
 
Thx 

Here is my guide to upgrade omv4to5. Hopefully this will help out others looking to do the same.
 
Was able to upgrade omv4 to 5. Here is my posts and the github bash script from the omv site: I downloaded the scripts then changed to executable.
https://forum.openmediavault.org/index.php?thread/27909-omv-5-0-finally-out/&pageNo=2  
https://forum.openmediavault.org/index.php?thread/27909-omv-5-0-finally-out/&pageNo=22
https://github.com/OpenMediaVault-Plugin-Developers/installScript/blob/master/upgrade4to5
https://forum.openmediavault.org/index.php?thread/33219-upgrade-to-5-x-failure/&pageNo=1
 
Steps to reproduce:
1. Remove incompatible plugins
2. Switch over to dockers that are incompatible
3. Download the two bash scripts:
wget https://github.com/OpenMediaVault-Plugin-Developers/installScript/raw/master/upgrade4to5
wget https://github.com/OpenMediaVault-Plugin-Developers/packages/raw/master/install
4. chmod +x the upgrade4to5 chmod +x install
5. Run the upgrade4to5 as root
6. omv and plugins will fail. as describes here: https://forum.openmediavault.org/index.php?thread/33219-upgrade-to-5-x-failure/&pageNo=1
7. Remove failed packages not purge since we want config files from omv They should print out.
8. Reinstall openmediavault only
9. Reboot
10. Run this command : apt-get purge openmediavault-omvextrasorg resolvconf
11. Reboot again
12. Run the install script as root. this will install omv extras.
13. apt update
14. apt dist-upgrade
15. omv-salt deploy run nginx
16. omv-salt deploy run phpfpm
17. But remove or move upsschedule-cmd from usr/bin and bin then run  apt-get install usrmerge
18. apt install docker
19. https://forums.docker.com/t/fa…te-nat-chain-docker/78269
The docker installer uses iptables for nat. Unfortunately Debian uses nftables. You can convert the entries over to nftables or just setup Debian to use the legacy iptables.
sudo update-alternatives --set iptables /usr/sbin/iptables-legacy
sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
dockerd, should start fine after switching to iptables-legacy.
sudo service docker start
20. Switch to 5.4 kernel using armbian-config refer to kobol blog: 
https://blog.kobol.io/2020/03/13/armbian-new-release/
Hopefully this helps others out.
Thanks