I'm currently preparing my notebook, a Dell Latitude E7440, for an upgrade. It still runs with Linux Mint 17.3 which is based on Ubuntu 14.04 (Trusty). Yes, this is EOL. Time to upgrade.
To run a full backup of data, I created a bootable USB stick from the current Knoppix (8.6) ISO image:
ckadm@mintp ~/Downloads/ISOS $ sudo dd if=KNOPPIX_V8.6-2019-08-08-EN.iso of=/dev/sdd status=progress
4640354816 bytes (4.6 GB, 4.3 GiB) copied, 533 s, 8.7 MB/s
9070592+0 records in
9070592+0 records out
4644143104 bytes (4.6 GB, 4.3 GiB) copied, 548.987 s, 8.5 MB/s
The stick was ready. After verifying the BIOS boot order was correct, it was time to boot from the Knoppix USB stick. But instead of booting Knoppix, an error message showed up:
Invalid partition table!
My first guess was that the partition table of the USB stick maybe missed a bootable flag. However the flag was set:
ckadm@mintp ~ $ sudo fdisk -l /dev/sdd
Disk /dev/sdd: 28.7 GiB, 30752636928 bytes, 60063744 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x12c649b0
Device Boot Start End Sectors Size Id Type
/dev/sdd1 * 64 9031679 9031616 4.3G 0 Empty
/dev/sdd2 9031680 9062399 30720 15M ef EFI (FAT-12/16/32)
/dev/sdd3 9062400 9070591 8192 4M 83 Linux
On the other hand the second partition (sdd2) caught my attention. Oh, this is now an (U)EFI partition?!
Back in the BIOS of the DELL Latitude, the boot option was checked. It was currently set to "Legacy":
After changing the boot option from Legacy to UEFI, Knoppix finally booted from the USB stick:
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