My motherboard suddenly died, but it was an old machine(running natty). So I put together a new Ubuntu system with a clean 14.04 install (same username) and mounted the old drive (with the full filesystem) as secondary device.

How can I get a full list of software installed on the old machine, from its disk mounted on the new one?

  • Sure, mount the hard drive, chroot into the system, and use dpkg --get-selections. – Faheem Mitha Sep 24 '14 at 17:05

Mount the old drive, e.g. under /mnt/old and then do:

 dpkg --root-dir /mnt/old --get-selections | grep -F ' install' ' | cut -f 1

dpkg has facilities built-in to install/list/de-install on a filesystem not based directly under /.

  • syntax was a bit different on my case, but this is the right way. Thanks – newbie Sep 25 '14 at 17:59

You have to boot via a linux Live, Then chroot to old linux, then:

dpkg -l "*" |grep ^ii |awk {'print $2'}

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