I was upgrading from 10 to 11.10 the other day when it shut down during the upgrade. When I boot my computer, it asks me to pick from a few options. If I go with the first choice, it takes an unusually long time to boot and I'm unable to wait for it, so I shut it down.
But if I pick "Previous version", I'm able to boot up 11.10 by selecting it from the previous version menu.
Can anyone help me figure out (1) why this is happening and (2) how to make 11.10 the default choice upon start-up?
It seems to be working fine. I'm using it now.