package management - Distribution upgrade stuck on postgresql confirmation window

I am upgrading ubuntu to new version, and the graphical distribution update now got stuck on this "pseudo-window" for postgresql.

What should I do? I cannot cancel the upgrade in any way cleanly; there is no "cancel". But I am now stuck.

The terminal window is not clickable. I cannot enter the terminal.

When you come up to windows like that during installations, they are not clickable. Instead, press the Tab until you see the OK highlighted, then press the Enter key.

Hope this helps!