reboot during upgrade

Giorgos Keramidas keramida at
Sat Aug 30 00:32:18 UTC 2008

On Fri, 29 Aug 2008 16:23:37 -0700, Chuck Swiger <cswiger at> wrote:
>> what consequences would appear if i'll reboot the machine once during
>> the upgrade?
> If you don't reboot in order to be using the new kernel before
> installing the new userland, you'll install critical things like sh
> and make which might not run using the old kernel.  You might find
> that the installworld part fails in the middle, and the system is left
> in an unusable state which is very hard to recover from.

Not to mention that if installworld suceeds but the new kernel panics at
every boot, you may end up with a userland that uses 'new' stuff to work
but with an unbootable kernel.  Rolling back to kernel.old may work (and
it usually does), but it's not a safe bet all the time.

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