Operating System not found

[pankajmalhotra]

Hi,

kernel version: 5.4.0-110-generic Distributor ID: Ubuntu Description: Ubuntu 20.04 LTS Release: 20.04 Codename: focal

Followed following steps:

1. downloaded the wget https://github.com/Tomas-M/linux-live/archive/v2.6.tar.gz

2. untar

3. updated config file to "/boot/vmlinuz"

4. Ran isolinux.bin.update under tools 5 copied files to ~/linux-live-2.6/bootfiles

5. executed ~/liux-live-2.6/build

6. /tmp/gen_linux_iso.sh

7. Iso file was generated.

8. Created a VM with mountable boot from iso image.

9. Rebooted the VM, disconnected CD. It says no operating system found.

Let me know if I missed any step.

Thanks, Pankaj

[tree-t]

Hello @pankajmalhotra,

1. Can you please provide a screenshot of the error?
2. Can you make an iso without performing step 2 and 3 on a fresh(unmodified) version of linux-live-kit?
3. Can you try using the iso on real hardware?( So as to verify that the iso is bootable or not) ~Tree-t :)

[pankajmalhotra]

Hi @tree-t ,

1. As far as screenshot is concerned, once I reboot the VM without iso, it doesn't come up.

• without updating config file, it doesn't build also

root@sjcvlbldub2042:/linux-live-2.6# ./build                
Changing current directory to /linux-live-2.6
Building initramfs image...
cp: cannot stat '/vmlinuz': No such file or directory

if I edit the config file "/boot/vmlinuz", everything comes up, but once I reboot without linking iso, it doesn't do that.

4. Currently running on real hardware is not possible, unless VM works.

Let me know if I have missed something Thanks, @pankajmalhotra

[tree-t]

Hello @pankajmalhotra ,

1. Can you please ensure that your vm isn't in uefi or efi mode?
2. Can you try using qemu as the vm? As mostly if the iso is bootable the vm will work(in qemu)

For qemu you have to:

1. Install it( on ubuntu , in a terminal):

sudo apt install qemu-common qemu-system-gui

3. Change the directory to the working directory (where the iso is stored)
4. Run the vm:

qemu-system-x86_64 -m 1G -cdrom *.iso

Note: Replace *.iso with the iso name. Breakdown of command options used: -m is used for allocating memory to the vm . 1G means 1GB, for mb use -m . eg:

-m 1m

If everything was fine, then the iso will boot normally. ~Tree-t :)