I want to migrate Gogs from Windows Server 2019 to a Linux VM running Ubuntu 22.04.5. On both sides the Gogs version is
0.12.3. I can access Gogs on Linux side, currently without repository. I could execute the backup command on Windows side and got a ZIP file. I executed the following restore command on Linux side:
$ sudo ./gogs/gogs restore --from=/home/dco/Documents/gogs-restore/gogs-backup-20250206133547.zip --verbose --config gogs/custom/conf/app.ini
I got the following error:

2025/02/06 14:26:08 [ INFO] Restore backup from: /home/dco/Documents/gogs-restore/gogs-backup-20250206133547.zip
2025/02/06 14:26:08 [FATAL] [....io/gogs/internal/cmd/restore.go:58 runRestore()] Failed to extract backup archive: zip: not a valid zip file

I supposed the ZIP format could differ between Windows and Linux. So extracted the files from the ZIP on Linux (without any problem) and compressed them again to get a Linux-made ZIP backup file. When I try to restore it, I get another error:
$ sudo ./gogs/gogs restore --from=/home/dco/Documents/gogs-restore/zip-20250206133547.zip --verbose --config gogs/custom/conf/app.ini

2025/02/06 14:28:16 [ INFO] Restore backup from: /home/dco/Documents/gogs-restore/zip-20250206133547.zip
Unzipping /home/dco/Documents/gogs-restore/zip-20250206133547.zip...
Extracting file...zip-20250206133547
Extracting file...zip-20250206133547/gogs-backup
Extracting file...zip-20250206133547/gogs-backup/custom
Extracting file...zip-20250206133547/gogs-backup/custom/conf
Extracting file...zip-20250206133547/gogs-backup/custom/conf/app.ini
Extracting file...zip-20250206133547/gogs-backup/data
...
Extracting file...zip-20250206133547/gogs-backup/db/User.json
Extracting file...zip-20250206133547/gogs-backup/db/Version.json
Extracting file...zip-20250206133547/gogs-backup/db/Watch.json
Extracting file...zip-20250206133547/gogs-backup/db/Webhook.json
Extracting file...zip-20250206133547/gogs-backup/metadata.ini
Extracting file...zip-20250206133547/gogs-backup/repositories.zip
2025/02/06 14:28:16 [FATAL] [....io/gogs/internal/cmd/restore.go:66 runRestore()] File 'metadata.ini' is missing

As you can see, the file metadata.ini is extracted, but declared as missing... Could someone please give me an explanation?
I found these discussions about this file, but do not think it is the same problem:

#6220
#6339