This question has been asked twice before on this forum, 6 months ago and 1 year ago, no solution was given. My problem is the same. I downloaded ubuntu-14.04.1-server-amd64.iso and used unetbootin (also tried Universal-USB-installer) to write a bootable UBS stick. I booted, chose "expert commandline install" and I get stuck at "download installer components from mirror site".
Is there really no way to install the server without a network connection? I was able to install the desktop version with no problems, but it will take me hours to remove all the packages I don't want to have on this system.
This installation will be dedicated to servicing a neutron detector and I need it to be headless with command-line only. It will be setup to serve data (huge amounts) when requested. It is on a private network but cannot be connected to the internet even for installation.
If anyone can give me a hint on how to do this, I will be very grateful.