Thanks, votdev, good to know. I will.
Solution from ryecoaaron in this thread:
Post
RE: omv-upgrade error after update to 7.7.24
apt doesn't like an empty Packages file without a Release file. Do you still get the error after the following?
rm /var/cache/openmediavault/archives/Packages
apt-get update
If you delete the Release and Packages file, apt-get update will recreate them properly.
rm /var/cache/openmediavault/archives/Packages
apt-get update
If you delete the Release and Packages file, apt-get update will recreate them properly.