I accidentally pressed Ctrl+C during Ubuntu Server's
do-release-upgrade process. I'd dropped to a shell to compare a .conf file in /etc/. When I pressed Ctrl-C, it asked whether I wanted to try to reattach to the upgrade process, but it failed to do so.
So I quit, and now there's a hanging dpkg process which is holding onto the apt lock. This is a virtualised server with no GUI frontend...
Is it possible to recover the upgrade process, or do I have to kill the dpkg process and start again?
screen -RD, but it didn't work. There wasn't any screen daemon running, so there was nothing to re-connect to. Exact error? I had a choice of 'r' or 'q' I think (reconnect or quit) at the bottom of a curses-like app. Sorry, I can't be more helpful than that. I was using VirtualBox, and without a tmux or screen session running I had no scrollback and the curses-like interface kept clearing the screen. Reconnect didn't work, so I just quit.
screen -R -Das both sudo user and my normal user..
dpkg configure -ais the right answer. That happened to me and the really bad thing was that bind9 was not correctly setup (i.e. the Ctrl-C must have stopped that process and it couldn't start anymore!) Once I fixed bind9 then the apt-get update + upgrade + dist-upgrade ran like a charm and after that I rebooted and it all worked.