Backup restore fails with an unknown error

[Jakub]

My description:

1) I run $ DEJA_DUP_DEBUG=1 deja-dup --restore | tail -n 1000 > /tmp/deja-dup.log
2) Restore from where .. OK
3) Restore from when .. OK
4) Restore to where (no matter where, ultimately fails in both cases) .. OK
5) Summary .. OK
6) Restoring... gives nothing in Details, runs cca 30s and asks me for su password (cf. screenshot-1.png, some details on the process)
7) Restore failed, Failed with an unknown error.

BTW, the log file remains empty all the time.

Requested info:

1. Linux distro: Ubuntu 20.04.2

2. Deja-dup version: 40.7

3. $ dconf dump /org/gnome/deja-dup/
[/]
backend='drive'
prompt-check='2021-07-09T09:58:28+00'

[drive]
folder='xxx'
icon='. GEmblemedIcon .%20GThemedIcon%20drive-harddisk-usb%20drive-harddisk%20drive%20drive-harddisk-usb-symbolic%20drive-harddisk-symbolic%20drive-symbolic .%20GEmblem%20changes-allow%201'
name='yyy'
uuid='04ebd0d9-7692-47a9-ab22-aaaaaaaaaaaa'

[file]
migrated=true

[gcs]
folder='xxx'

[google]
folder='xxx'

[local]
folder='xxx'

[openstack]
container='xxx'

[rackspace]
container='xxx'

[remote]
folder='xxx'

[s3]
folder='xxx'

4. gives empty file (!!)

[Michael Terry (mterry)]

Hello! Sorry for the delay in responding and that Deja Dup is giving you trouble.

Can you try running the following command, then trying to restore again?

gsettings set org.gnome.DejaDup root-prompt false

This will disable that superuser password prompt you see in your screenshot and just try to restore even if we think we need superuser access (which sometimes we get wrong). There were enough issues with our attempt to use superuser access that we stopped doing it at all in versions 42.0 and up. But in your version, you can get that same result with the above command.

[Launchpad Janitor (janitor)]

[Expired for Déjà Dup because there has been no activity for 60 days.]