Public bug reported:

Attempting to use PXE to install 16.04 results in an error dialog that
states "The failing step is: Install the system".  Checking syslog shows
that it has prefixed the URL to the filesystem.squashfs with "/cdrom"
and failed to find the file.

base-installer: info: Downloading
/cdromhttp://192.168.1.251/ubuntu-1604.amd64/install/filesystem.squashfs
to /tmp/live-installer/filesystem.squashfs

Setting the path to the filesystem.squashfs by either the "append"
option in the PXE default file, or as a preseed option in the kickstart
file both have the same result.

My PXE menu option:

LABEL Ubuntu 16.04 Desktop
MENU LABEL Xenial 16.04 Desktop
KERNEL 1604/ubuntu-installer/amd64/linux
append vga=normal ks=http://192.168.1.251/ks-1604-64-desktop.cfg 
initrd=1604/ubuntu-installer/amd64/initrd.gz 
live-installer/net-image=http://192.168.1.251/ubuntu-1604.amd64/install/filesystem.squashfs
 biosdevname=0

I found a changelog for live-installer 51ubuntu1 dated 4/18/16 that
states it strips /cdrom/ prefix from all places, but this does not
appear to be happening.  The log line points to base-installer rather
than live-installer as the cause.


This is from the 16.04 server release ISO, running 
base-installer_1.158ubuntu2_amd64 and live-installer_51ubuntu2_amd64

I would expect that locating the live-installer filesystem.squashfs
would not prefix the specified URL with /cdrom.  Previous versions of
Ubuntu did not do this.

** Affects: live-installer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1575652

Title:
  PXE install prefixes /cdrom to squashfs location, fails to find it

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