Create ISO from Linux image with verify

Question

Ive been having problems doing a Ubuntu install (ubuntu 18.10 optimus dual boot hang on first boot (Dell 7567 )) and think it may be the USB stick was not written properly. How can I write and verify the image (was using windows to do this but do have another Linux box I can use to make the USB). I know there is a verify in the installation menu but would rather do it manualy (i.e. with CLI).

Answer 1

For that purpose USB has a file md5sum.txt

1. Plug in the USB drive in any Linux OS.

2. CD to USB drive

   cd /media/$USER/<drive name>
   

3. Run

   md5sum -c md5sum.txt | grep -v OK || echo "All OK"
   

   If there is a defect, output is something like

   md5sum: WARNING: 1 computed checksum did NOT match
   

   If not

   All OK
   

   No output means all OK.

   For full report run

   md5sum -c md5sum.txt