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I can't use apt-offline to update my package lists, which means that I will get many 404s when trying to install older versions of packages that it thinks it's downloading from the .sig file it generates. I can apt-get --simulate install or upgrade, but I can't simulate update (as in package lists), and it says "E: command line option --simulate is not understood." On my Ubuntu machine (connected to the internet) I can apt-get --simulate update just fine and it will simulate an update on any account.

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I got this same error as well with the latest version of Ubuntu. I'm not on the machine that had these issues at the moment, but I figured out a workaround.

First, locate the python files that are used by apt-offline, if memory services I think it was /usr/lib/python2.7/distribution-files/apt_offline_core/ or something like that. There's a file I think called apt_offline_core.py and in there is a single line that executes the command "apt-get update -qq --simulate --print-uris update". I changed the line by removing the --simulate (I don't think --simulate is necessary, given that --print-uris makes apt-get not actually do anything) and also I had to remove one of the -q's. So it now read:

apt-get -q --print-uris update

This worked. Apparantly the bug is in the apt-get package, and not apt-offline itself. I am running an older installation of ubuntu with an older version of apt-offline and that installation works and the line of code with --simulate is unchanged. So the bug is in the apt system.

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This was fixed in 14.04 (apt-offline was bumped to 1.3.1 but -v still reports 1.3)

https://bugs.launchpad.net/ubuntu/+source/apt-offline/+bug/1323976

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