I’m trying to deploy Ubuntu on /dev/sdb (SSD drive) but it looks like MAAS is configured to use only /dev/sda for boot !
Before to run the installation the parition /dev/sdax should be removed and disable theboot from it in the BIOS, and create a new partition on /dev/sdb (or other name) then specify the boot from this partition.
By default MAAS configures deployments to use /dev/sda however you can configure MAAS to use any disk you want. To use /dev/sdb select the machine you want to configure, goto the storage tab and remove ‘/’ which is on /dev/sda. Then select action next to /dev/sdb and create a new ‘/’ partition. You should also make sure boot is selected on /dev/sdb.