Public bug reported: Binary package hint: lupin-casper
The use case is that I was trying to run the LiveCD for the Ubuntu Karmic beta (http://releases.ubuntu.com/releases/9.10/ubuntu-9.10-beta- desktop-i386.iso) without burning a CD. Instead I tried using grub2's loopback feature to load the iso image from an ext4 partition. Instead my ext4 partition wasn't loaded, and I got dropped to the shell from the initramfs due to a panic in /scripts/casper-premount/20iso_scan (on line 35 along with the error message I get). I was able to continue loading the LiveCD with the following commands: (initramfs) mount -t ext4 /dev/sda5 /isodevice (initramfs) echo "LIVEMEDIA=/isodevice/home/dylan/Desktop/ubuntu-9.10-beta-desktop-i386.iso" >> /conf/param.conf (initramfs) echo "LIVEMEDIA_OFFSET=0" >> /conf/param.conf (initramfs) exit # Grub2 menuentry for booting the iso image: menuentry "ubuntu-9.10-beta.iso" { insmod ext2 loopback loop (hd0,5)/home/dylan/Desktop/ubuntu-9.10-beta-desktop-i386.iso linux (loop)/casper/vmlinuz iso-scan/filename=/home/dylan/Desktop/ubuntu-9.10-beta-desktop-i386.iso file=/cdrom/preseed/ubuntu.seed boot=casper quiet initrd (loop)/casper/initrd.lz } I found the problem was in /scripts/lupin-helper, since it's is_supported_fs function doesn't list ext4 as supported, so my ext4 partitions get skipped when looking for the iso file, even though I had no problem mounting the ext4 filesystem manually. I fixed the problem with the following steps after booting normally (i.e. no LiveCD): mount -o loop /home/dylan/Desktop/ubuntu-9.10-beta-desktop-i386.iso /mnt mkdir ~/cpio && cd ~/cpio lzcat < /mnt/casper/initrd.lz | cpio -id vi ~/cpio/scripts/lupin-helper # See the attached patch for my changes. find . -print | cpio -o -H newc | lzma -c > ~/initrd.lz sudo vi /boot/grub/grub.cfg # Change the initrd line: initrd (hd0,5)/home/dylan/initrd.lz The lupin-helper script appears to be part of the lupin-casper package, and my patch still applies to bazaar repository for the package (http://bazaar.launchpad.net/~ubuntu-installer/lupin/hardy). lupin-casper version: 0.25 Let me know if anything isn't clear (e.g. I may have made typos in the commands for this post). ** Affects: lupin (Ubuntu) Importance: Undecided Status: New -- Failed to boot LiveCD iso from ext4 parition https://bugs.launchpad.net/bugs/454456 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
