Hi,
i have this problem too.
using 5.03-1 Beta on Debian Buster -
what I try:
- ssh as root on my nas
Code
root@CoinOMV01:~# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up openmediavault (5.0.3-1) ...
Creating configuration database ...
Migrating configuration database ...
ERROR: Failed to apply migrations: The script '/usr/share/openmediavault/confdb/migrations.d/conf_5.0.3.sh' is not executable
not good 
next step: chmod -x /usr/share/openmediavault/confdb/migrations.d/conf_5.0.3.sh
and retry
Python
root@CoinOMV01:/usr/share/openmediavault/confdb/migrations.d# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up openmediavault (5.0.3-1) ...
Creating configuration database ...
Migrating configuration database ...
Running migration conf_5.0.3
Setting up Salt environment ...
Setting up system ...
[WARNING ] /usr/lib/python3/dist-packages/salt/modules/file.py:32: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
from collections import Iterable, Mapping
[WARNING ] /usr/lib/python3/dist-packages/salt/utils/jinja.py:582: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
if isinstance(lst1, collections.Hashable) and isinstance(lst2, collections.Hashable):
[WARNING ] /usr/lib/python3/dist-packages/salt/utils/decorators/signature.py:31: DeprecationWarning: `formatargspec` is deprecated since Python 3.5. Use `signature` and the `Signature` object directly
*salt.utils.args.get_function_argspec(original_function)
Processing system modifications ...
Processing triggers for openmediavault (5.0.3-1) ...
Restarting engine daemon ...
Updating locale files ...
Updating file permissions ...
Purging internal cache ...
W: Operation was interrupted before it could finishFinally to complete the installation you need to run the following command: â
omv-confdbadm populate
after reboot, no error displayed
I can activate nfs and all services displayed in dashboard.
I hope it helps