a noobie here. I'm trying to fix my dual-boot win 11 / ubuntu 24.04.01 LTS and I wanted to give a try to the solution suggested in this answer: https://askubuntu.com/a/1533444/2110314 . I followed the guide at https://wiki.ubuntu.com/Testing/EnableProposed and enabled Pre-released updates (release_name-proposed) but when it came to enabling Pre-release updates (trusty-proposed) my Updates tab didn't show any type of option as shown in the screenshot.
I then tried to run, as suggested in the answer, sudo apt install -t oracular-proposed grub-common grub-efi-amd64-bin grub-efi-amd64-signed grub-efi-amd64-unsigned grub-pc grub-pc-bin grub2-common but, as expected (I suppose), it failed and gave me an error with written APT::Default-Release (the only thing I remember). I then so tried to add the oracular repository through the Other Software tab and entered the following apt line: ' deb http://archive.ubuntu.com/ubuntu/oracular-proposed main universe multiverse ' and it gave me this error : ' ...the repository https... does not have a release file. Updating from such a repository can't be done securely, and is therefore disabled by default. ... '. I then tried installing again with sudo apt install -t oracular-proposed grub-common grub-efi-amd64-bin grub-efi-amd64-signed grub-efi-amd64-unsigned grub-pc grub-pc-bin grub2-common this grub version but I was given the error 'E: Unable to locate package grub-efi-amd64-unsigned'.
What do i have to do to enable this repository so I can download this grub version?
Thank you all
P.S. Mind me if I've made any wrong assumptions.
