Public bug reported:
When trying to use preseeding, the loading of preseeding file fails due
to the /cdrom directory not being mounted.
First when I try to install, no error message is shown and installation
progresses as normal. However, if I explicitly select the menu option
Load debconf
https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1157643/comments/11
Worked for me as well
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https://bugs.launchpad.net/bugs/1240327
Title:
E: Sub-process /usr/bin/dpkg returned an
