I also had the same problem on lucid amd64 and had to ctrl+c it too.
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package libsnmp-base 5.4.2.1~dfsg-3ubuntu2 failed to install/upgrade:
subprocess installed post-installation script killed by signal (Interrupt)
https://bugs.launchpad.net/bugs/490683
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Seems to be a good patch. No typos and has a clear message.
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Reboot needed after domainjoin before login into Gnome as a domain user
https://bugs.launchpad.net/bugs/352934
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