# Failure mender-convert on dd step **URL:** \ **Category:** General Discussions\ **Tags:** mender-convert\ **Created:** [March 27, 2023, 3:11am UTC](https://hub.mender.io/t/failure-mender-convert-on-dd-step/5711 "2023-03-27T03:11:18Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![petermilani80](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/petermilani80/32/1863_2.png) [@petermilani80](https://hub.mender.io/u/petermilani80)\ **Post date:** [March 27, 2023, 3:11am UTC](https://hub.mender.io/t/failure-mender-convert-on-dd-step/5711/1 "2023-03-27T03:11:18Z")
Hi I am trying to convert a ubuntu server 22 minimised image as golden image. After a bit of work to get a mountable golden-image I have tried the convert script in the docker container, via ```auto $ MENDER_ARTIFACT_NAME="release-1" ./docker-mender-convert --disk-image input/golden-image-1.img ``` The golden image is ubuntu server 2022 minimised with two partitions a boot fat32 and / ext4 of 1G and 6G respectively. stdout: ```auto using log file at: /home/peter-laptop/mender-drive/mender-convert/logs/convert.log.1679886704-880354 Running mender-convert --disk-image input/golden-image-1.img Running mender-convert-extract: --config ./work/override_compression_config --disk-image input/golden-image-1.img 2023-03-27 03:11:44 [INFO] [mender-convert-extract] Using configuration file: configs/mender_convert_config 2023-03-27 03:11:44 [INFO] [mender-convert-extract] Using configuration file: ./work/override_compression_config 2023-03-27 03:11:44 [INFO] [mender-convert-extract] Validating disk image 2023-03-27 03:11:44 [INFO] [mender-convert-extract] Disk parsed successfully 2023-03-27 03:11:44 [INFO] [mender-convert-extract] NUMBER OF PARTS: 2 TYPE: gpt 2023-03-27 03:11:44 [INFO] [mender-convert-extract] PART 1: SIZE: 1.1G TYPE: c12a7328-f81f-11d2-ba4b-00a0c93ec93b 2023-03-27 03:11:44 [INFO] [mender-convert-extract] PART 1: extracting to work/part-1.fs 2023-03-27 03:11:47 [INFO] [mender-convert-extract] PART 2: SIZE: 6G TYPE: 0fc63daf-8483-4772-8e79-3d69d8477de4 2023-03-27 03:11:47 [INFO] [mender-convert-extract] PART 2: extracting to work/part-2.fs 2023-03-27 03:12:18 [INFO] [mender-convert-extract] Extracting boot gap to work/boot-gap.bin mender-convert-extract has finished. Cleaning up... Running mender-convert-modify: --config ./work/override_compression_config --disk-image input/golden-image-1.img 2023-03-27 03:12:18 [INFO] [mender-convert-modify] Using configuration file: configs/mender_convert_config 2023-03-27 03:12:18 [INFO] [mender-convert-modify] Using configuration file: ./work/override_compression_config mount: /mender-convert/work/rootfs: wrong fs type, bad option, bad superblock on /dev/loop20, missing codepage or helper program, or other error. mender-convert-modify has finished. Cleaning up... umount: work/rootfs: not mounted. 2023-03-27 03:12:18 [ERROR] [mender-convert] mender-convert failed 2023-03-27 03:12:18 [DEBUG] [mender-convert-extract] When running: (modules/disk.sh:63): run_and_log_cmd(): dd if=input/golden-image-1.img of=work/boot-gap.bin skip=1 bs=512 count=2047 conv=sparse status=none 2023-03-27 03:12:18 [INFO] [mender-convert-modify] Using configuration file: configs/mender_convert_config 2023-03-27 03:12:18 [INFO] [mender-convert-modify] Using configuration file: ./work/override_compression_config 2023-03-27 03:12:18 [ERROR] [mender-convert] mender-convert failed 2023-03-27 03:12:18 [ERROR] [mender-convert] mender-convert exit code: 32 Log file available at: /home/peter-laptop/mender-drive/mender-convert/logs/convert.log.1679886704-880354 ``` The log file records some failure when building the boot-gap.bin: ```auto 2023-03-27 02:01:59 [INFO] [mender-convert-extract] Using configuration file: configs/mender_convert_config 2023-03-27 02:01:59 [INFO] [mender-convert-extract] Using configuration file: ./work/override_compression_config 2023-03-27 02:01:59 [INFO] [mender-convert-extract] Validating disk image 2023-03-27 02:01:59 [INFO] [mender-convert-extract] Disk parsed successfully 2023-03-27 02:01:59 [INFO] [mender-convert-extract] NUMBER OF PARTS: 2 TYPE: gpt 2023-03-27 02:01:59 [INFO] [mender-convert-extract] PART 1: SIZE: 1.1G TYPE: c12a7328-f81f-11d2-ba4b-00a0c93ec93b 2023-03-27 02:01:59 [INFO] [mender-convert-extract] PART 1: extracting to work/part-1.fs 2023-03-27 02:02:02 [DEBUG] [mender-convert-extract] Running: (modules/disk.sh:63): run_and_log_cmd(): dd if=input/golden-image-1.img of=work/part-1.fs skip=2048 bs=512 count=2201600 conv=sparse status=none 2023-03-27 02:02:02 [INFO] [mender-convert-extract] PART 2: SIZE: 6G TYPE: 0fc63daf-8483-4772-8e79-3d69d8477de4 2023-03-27 02:02:02 [INFO] [mender-convert-extract] PART 2: extracting to work/part-2.fs 2023-03-27 02:02:31 [DEBUG] [mender-convert-extract] Running: (modules/disk.sh:63): run_and_log_cmd(): dd if=input/golden-image-1.img of=work/part-2.fs skip=2203648 bs=512 count=12582879 conv=sparse status=none 2023-03-27 02:02:31 [INFO] [mender-convert-extract] Extracting boot gap to work/boot-gap.bin 2023-03-27 02:02:31 [DEBUG] [mender-convert-extract] Running: (modules/disk.sh:63): run_and_log_cmd(): dd if=input/golden-image-1.img of=work/boot-gap.bin skip=1 bs=512 count=2047 conv=sparse status=none 2023-03-27 02:02:31 [INFO] [mender-convert-modify] Using configuration file: configs/mender_convert_config 2023-03-27 02:02:31 [INFO] [mender-convert-modify] Using configuration file: ./work/override_compression_config 2023-03-27 02:02:31 [ERROR] [mender-convert] mender-convert failed 2023-03-27 02:02:31 [ERROR] [mender-convert] mender-convert exit code: 32 ``` Any suggestions on what is wrong? ---
**Author:** ![petermilani80](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/petermilani80/32/1863_2.png) [@petermilani80](https://hub.mender.io/u/petermilani80)\ **Post date:** [March 27, 2023, 3:17am UTC](https://hub.mender.io/t/failure-mender-convert-on-dd-step/5711/2 "2023-03-27T03:17:28Z")
So it seems my rootfs partition cannot be mounted. It also cannot be mounted when I replicate the same commands. I have been able to mount the partition using the ```auto losetup -o 1128267776 /dev/loop20 golden-image-1.img sudo mount /dev/loop20 mnt # Can now access the rootfs sudo umount mnt sudo losetup -d /dev/loop20 ``` My golden image was built on a 500GB nvme drive with only the 1G /boot and 6G / partitions. I had to use gdisk to rebuild the partition table after I copied it off using `dd` with `conv=fdatasync,sparse` to remove size errors from the golden image. ---
**Author:** ![petermilani80](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/petermilani80/32/1863_2.png) [@petermilani80](https://hub.mender.io/u/petermilani80)\ **Post date:** [March 27, 2023, 7:18am UTC](https://hub.mender.io/t/failure-mender-convert-on-dd-step/5711/3 "2023-03-27T07:18:39Z")
I reinstalled ubuntu-server onto a 8GB usb stick, then copied it off. This image which allowed dd to run over the entire length of the block device works as expected. Not sure if there is a fix if using a target device which is much larger than the partitions.