Hendrik Boom <hendrik@???> wrote:

> However, when booting the unidentified Linux system, it mounts exactly
> the same partitions as the old Linux system. It appears to
> completely ignore the new /etc/fstab in the new system.

Are you using an initrd/initramfs ? If so, did you update it ? That's one possible explanation - you load the "new" init image, that contains the old fstab which is used for the intitial mounts, but when the system is booted you see the new modified fstab.