[Bug 1969970] Re: ubuntu jammy 22.04 iso: unable to find a live file system on the network

[Maxime Accadia]

We faced this issue too, it was caused by having the initrd and vmlinuz
from a previous Ubuntu ISO

```
KERNEL vmlinuz # <= should be from casper/vmlinuz in Ubuntu ISO
INITRD initrd  # <= should be from casper/initrd in Ubuntu ISO
APPEND root=/dev/ram0 ramdisk_size=1500000 ip=dhcp cloud-config-url=http://192.168.0.2/autoinstall.yaml url=http://192.168.0.2/ubuntu-22.04.3-live-server-amd64.iso autoinstall
```

See for example https://github.com/canonical/autoinstall-desktop#pxe-
configuration

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https://bugs.launchpad.net/bugs/1969970

Title:
  ubuntu jammy 22.04 iso: unable to find a live file system on the
  network

Status in casper package in Ubuntu:
  Invalid

Bug description:
  I'm trying to pxe boot ubuntu jammy 22.04 iso from
  https://releases.ubuntu.com/22.04/ubuntu-22.04-live-server-amd64.iso,
  but it fails to boot with the error:

    unable to find a live file system on the network

  This problem can be worked around by setting the ignore_uuid kernel
  command line argument. But, I think we should not need to specify
  that, and maybe there's a problem with the UUID of the iso.

  I'm not sure if the helps, but blkid is returning:

  root at pxe:~# blkid 
  /dev/loop0: BLOCK_SIZE="2048" UUID="2022-02-17-11-56-08-00" LABEL="Ubuntu-Server 22.04 LTS amd64" TYPE="iso9660" PTUUID="949bae1b-adc7-4b27-be24-901c7c269b89" PTTYPE="gpt"

  
  And it seems the iso contains a different UUID:

  root at pxe:~# cat /cdrom/.disk/casper-uuid-generic 
  b897861a-11af-4ce6-88c1-b6ac2af8457b

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