Short version: Byte 480 of the Ubuntu desktop 20.04.1 LTS installation kit has been modified during installation. Is this by design?
Detailed version: I use to create my usb stick install kit with: # dd if=downloads/ubuntu-20.04.1-desktop-amd64.iso of=/dev/sdd and it worked for me. I also use to verify the install kit before and after install with: # cmp downloads/ubuntu-20.04.1-desktop-amd64.iso /dev/sdd and this also worked for me until now. It exits with end of file error, because the kit is shorter than /dev/sdd. Now, however, for the first time, there is a difference after install at byte 480, line 4. The kit has been created on a compromised system. However, I have doubts that it has been modified by malicious code. So I ran: # mount /dev/sdd1 mnt # mount -o loop ubuntu-20.04.1-desktop-amd64.iso mnt1 # find mnt/ -exec bash -c 'file={}; cmp $file ${file/mnt/mnt1}' \; | grep differ and found no difference, only that cmp does not compare directories. # lsblk -fm /dev/sdd NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT SIZE OWNER GROUP MODE sdd iso966 Ubuntu 20.04.1 LTS amd64 │ 2020-07-31-16-51-12-00 7,2G root disk brw-rw---- ├─sdd1 │ iso966 Ubuntu 20.04.1 LTS amd64 │ 2020-07-31-16-51-12-00 2,6G root disk brw-rw---- ├─sdd2 │ vfat C26E-047E 3,9M root disk brw-rw---- └─sdd3 ext4 writable a83a9b1c-36cb-4312-9aba-0359f74c0374 4,7G root disk brw-rw---- What could be the cause? Should I worry about this? Also aked here: https://askubuntu.com/questions/1269405/installation-kit-modified-during-install-is-this-a-security-issue -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss