What should I do when I've hit "start a new shell to examine the situation"

I have selected "start a new shell to examine the situation" when upgrading from Ubuntu 14.04 to 14.10 from the "Distribution Upgrade" tool.

The prompt popped up because the php.ini config file was going to be replaced, but the current one had been modified.

Now I'm in the installer shell (it hasn't opened a new one) and the installation stopped, it seems like if I have to do something, but I don't know what.

Distribution Upgrade is in the middle of the upgrade!

Should I press anything?

Solution 1:

Hitting Ctrl+D re-enabled the prompt and allowed me to continue the installation.