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Why Ubuntu Server asks to insert a CD-ROM when installed from PXE?

rated 0 times [ 2] [ 0] / answers: 1 / hits: 5771 / 10 Months ago, fri, december 9, 2022, 3:05:26

I set up a PXE server which hosts both Ubuntu Desktop and Ubuntu Server.

Ubuntu Desktop is installed successfully from PXE.

Ubuntu Server seems to successfully load vmlinuz and initrd.gz, asks for the language, then the location, then the keyboard layout, and finally complains that it can't mount the CD-ROM:

Your installation CD-ROM couldn't be mounted. This probably means that the CD-ROM was not in the drive. If so you can insert it and try again. Retry mounting the CD-ROM? (Yes) (No)

The content of /var/lib/tftpboot/pxelinux.cfg/default is the following:

default ubuntu-installer/amd64/boot-screens/vesamenu.c32

menu title Ubuntu setup

label ubuntu-14.04-desktop-amd64

    menu label ubuntu-14.04-desktop-amd64

    kernel ubuntu-14.04-desktop-amd64/vmlinuz.efi

    append initrd=ubuntu-14.04-desktop-amd64/initrd.lz root=/dev/nfs boot=casper netboot=nfs nfsroot=192.168.1.41:/exports/ubuntu-14.04-desktop-amd64 splash --

label ubuntu-14.04-server-amd64

    menu label ubuntu-14.04-server-amd64

    kernel ubuntu-14.04-server-amd64/vmlinuz

    append initrd=ubuntu-14.04-server-amd64/initrd.gz root=/dev/nfs boot=install netboot=nfs nfsroot=192.168.1.41:/exports/ubuntu-14.04-server-amd64 splash --

What explains the fact that it requests the CD-ROM and how to avoid it?

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kroapathe

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2 Years ago

answered 10 Months ago biryanrownies · Accepted Answer

I had the same problem trying to PXE boot the 14.04 server-amd64 disc. I finally noticed I had used the wrong initrd.gz. Make sure you are using the one from /install/netboot/ubuntu-installer/amd64 on the disc. The filesize for mine (14.04, not 14.04.1) is: 21256771.

Here is my pxeconfig entry:

   LABEL Ubuntu 14.04 Server amd64

        kernel http://172.20.1.9/tftpboot/Ubuntu/14.04/server-amd64/vmlinuz

        append boot=casper netboot=nfs nfsroot=172.20.1.9:/images/Ubuntu/14.04/server-amd64/ initrd=http://172.20.1.9/tftpboot/Ubuntu/14.04/server-amd64/initrd.gz ip=dhcp --

        MENU LABEL Ubuntu 14.04 Server amd64

        TEXT HELP

    Ubuntu Server 14.04 amd64 with NFS root

    ENDTEXT