Disk root error on start instance on "Amazon Web Services (AWS)" EC2
Solution 1:
Answer is very easy,
when you "Attach Volume" again set parameter:
Device: /dev/sda1
WARN! If you haven't own "Elastic Network Interface (ENI)" beware change of address on "Instance Start".
Thanks M. Brown
Solution 2:
With /dev/sda1 won't work anymore. Directly specify xvda (just it, without /dev) on the Device field.
(well, seems a transient issue, this happened in Oregon region, I tried it in Ireland and you got to specify /dev/sda1 as usual)