The maps * command only lists what YOU(the client) have on your computer, not the dedicated server's AFAIK.
Check if the Linux Dedicated Server actually have the campaign in its addons folder.
Last but not least, do a Server restart via your dedicated server provider (they should have the option to do so) because VPK files don't work immediately after dropping them in the folder.
Note: That is assuming the Linux Server isn't running on the same machine as you