I've created a custom ISO file from the original one via mkisofs , but now I'm unable to boot it in VirtualBox 5.2 :
FATAL : Couldn't read from the boot medium ! System halted.
And here's the command I've used to create the ISO:
sudo mkisofs -o ubuntu.iso test2/
I've just replaced the
casper/filesystem.squashfs file (although I needed to update the
/md5sums.txt but those are not my concern here, because the problem is with the ISO file itself.The VBox even cannot boot the kernel , let alone the filesystem integrity check).
The origianal ISO file is :
Any help is much appreciated
EDIT: Surely the problem is with mkisofs because I tried making an ISO file out of an extracted ISO (the original one) without any slightest manipulation , but I got that error again.
Looks like just a boot flag is missing , but I don't know how to add it.