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To solve the problem, I tried to reinstall my Ubuntu Desktop 22.04 system, creating a new set of partitions, mostly automatically, and then erasing the disk.

However, after I completed the task,...

Did you mount the efivars when in chroot? - Yes, I did.

Meanwhile, I don't manage to execute commands like `ls (hd0,1)/boot`. Gives an error. What do you want to say with this command.

My...

I tried to follow
https://askubuntu.com/questions/53578/can-i-install-in-uefi-mode-with-the-alternate-installer/57380#57380

After chroot and mounting, I did:

$ grub-install --recheck...

My system was assembled by me, with a ASUS Prime motherboard, and a SSD Kingston A400 480 Gb. The system is dated from about 2019.

After booting with the Ubuntu Installation CDROM, I run the SMART...

Unfortunately, my BIOS doesn't have such options. However, I set all the Boot Devices (Storage, Network, ...) to UEFI only.

Is it a possibility to reinstall Ubuntu from a CD (22.04 LTS),...

I have tried the Boot-Repair recommendation. The report is in https://paste.ubuntu.com/p/z5pYfP7nFH/

However, after setting to UEFI only the whole CSM menu: Boot from Storage Device, Boot from...

Yes I think, but I would not like to reformat the disk to start an installation from scratch.

In fact, my system worked well until some weeks (months?) ago.

I have changed the BIOS settings, enabling "UEFI only" for "Launch CSM\Boot Device Control" and "Launch CSM\Boot from Storage Devices".

However, the BIOS presents the same problem: the SSD is not...

1. When I access BIOS, the CDROM is listed, but the SSD is not listed.
2. When I boot the computer without a CDROM in it, the system doesn't boot. Says something like: "Insert a boot device and...

I installed successfully, some years ago, a Ubuntu Desktop 22 LTS in a bootable SSD on a Intel i5 Desktop System. This system was only sometimes in usage.

Now, when I switch on my Desktop, the...