Rclone+union: 500 Internal Server Error during init

Getting Help
1

Hi all, I’ve some trouble while trying to configure a new restic repository over a rclone union backend.
rclone union backend is named “un”, and it appears to be working correctly as I have tried to copy some files over there using rclone copy "." un: without issues.
Please see my versions:

$ rclone version
rclone v1.68.1
- os/version: ubuntu 24.04 (64 bit)
- os/kernel: 6.8.0-48-generic (x86_64)
- os/type: linux
- os/arch: amd64
- go/version: go1.23.1
- go/linking: static
- go/tags: none

$ restic version
restic 0.17.3 compiled with go1.23.3 on linux/amd64

When I issue init command, I receive the following error:

$ restic -r rclone:un: -p restic_password.txt init
rclone: 2024/11/10 19:05:31 ERROR : : Create repo failed to Mkdir: object not found
Fatal: create repository at rclone:un: failed: Fatal: unable to open repository at rclone:un:: unexpected HTTP response (500): 500 Internal Server Error

Do you know what could be wrong in my setup?
Thanks in advance

2

Ok, I’ve found the solution reading post 7063.
The following rclone configuration (instead of the default policies) did the trick:

$ rclone config show
...
[un]
type = union
upstreams = rep4e: rep5e:
action_policy = eplus
create_policy = lus