i tested for few days this.
The most simple way to install ubuntu server on raid1 and install grub2 is…
Attention. With LARGE hd use new gpt system
1) start ubuntu-desktop
parted /dev/sda; mklabel msdos
parted /dev/sdb; mklabel msdos
create 1 partition with type fd and flag boot checked
The same for disk sdb
reboot with server ubuntu
– create software raid with ubuntu interface
– create lvm volume (i create 800 m for boot and the rest for root) Most simple!!!
– continue installation
after reboot wait to sync disc cat /proc/mdstat
grub-install /dev/sda
grub-install /dev/sdb
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