How do I reattach to Ubuntu Server's 'do-release-upgrade' process?

Posted by Alex Leach on Server Fault See other posts from Server Fault or by Alex Leach
Published on 2012-05-09T17:18:44Z Indexed on 2012/09/13 9:40 UTC
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ubuntu

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recover

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do-release-upgrade

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?

UPDATE:-

AFAICT, there was no way to reattach to the upgrade process. However, it wasn't a disaster at all. I killed the hanging dpkg process, and then ran dpkg --configure -a. This walks you through reconfiguring all packages already installed on the system, tidying up any problems whilst it does so. After that, I used aptitude to upgrade the remaining packages, which had already been downloaded, but hadn't been installed or configured.

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