How to Boot from NVMe SSD?

But today Ubuntu Update downloaded some updates from nvidia repository ( this and this ), requested to reboot and then Xavier failed to boot system, hanging on initrd step.

IMO it’s safer to just put commonly used stuff on a ssd and not the entire of /. I’m not sure how much benefit you get from having stuff like /etc on an ssd, since it’s mostly a bunch of text files.
My partition layout looks like:

nvme0n1      259:11   0 931.5G  0 disk
├─nvme0n1p1  259:12   0 119.2G  0 part /tmp
├─nvme0n1p2  259:13   0 323.9G  0 part /home
├─nvme0n1p3  259:14   0   250G  0 part /usr
└─nvme0n1p6  259:15   0 238.4G  0 part /var/lib/docker

Those are just ext4 partitions on a GPT disk, but you may wish to use something fancier like LVM or btrfs with subvolumes for easier resizing.

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