Here is the attachement, sorry for forgetting it the first time.
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Thank you Maxime.
I would like to (1) upgrade the deamon, and then (2) use it to update all packages. I hence started by reading the manual:
Because I am running on a foreign distro, I used the command "sudo -i guix pull" as indicated.
Following your advice, I used today "guix pull", but I got the same message.
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Thank you Simon. I copy-pasted your command but I have no file named "/gnu/store/n8vdar2f60mvq62g7mngpqwykbm9rw1q-guix-1.2.0rc2-1.0d4b1af".
Best,