[xubuntu-users] PS: How to check burnt iso

[Ralf Mardorf]

On Sat, 2025-04-19 at 19:36 +0200, Ralf Mardorf wrote:     
> In 70 minutes I can say, if the script lines related to the gpg key
> need a fix or if they're still ok in 2025.

The script from 2016 still works:

      [snip]
      FINISHED --2025-04-19 20:23:41--
      Total wall clock time: 1h 13m 24s
      Downloaded: 3 files, 4.0G in 1h 13m 23s (941 KB/s)
      
      gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys FBB75451 EFE21092
      
      
      Press a key to continue 
      
      
      gpg: key D94AA3F0EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) <cdimage at ubuntu.com>" not changed
      gpg: key 46181433FBB75451: "Ubuntu CD Image Automatic Signing Key <cdimage at ubuntu.com>" not changed
      gpg: Total number processed: 2
      gpg:              unchanged: 2
      
      gpg --list-keys --with-fingerprint FBB75451 EFE21092
      
      
      Press a key to continue 
      
      
      pub   dsa1024 2004-12-30 [SC]
            C598 6B4F 1257 FFA8 6632  CBA7 4618 1433 FBB7 5451
      uid           [ unknown] Ubuntu CD Image Automatic Signing Key <cdimage at ubuntu.com>
      
      pub   rsa4096 2012-05-11 [SC]
            8439 38DF 228D 22F7 B374  2BC0 D94A A3F0 EFE2 1092
      uid           [ unknown] Ubuntu CD Image Automatic Signing Key (2012) <cdimage at ubuntu.com>
      
      
      gpg --verify SHA256SUMS.gpg SHA256SUMS
      
      
      Press a key to continue 
      
      
      gpg: Signature made Sat 22 Feb 2025 08:19:01 CET
      gpg:                using RSA key 843938DF228D22F7B3742BC0D94AA3F0EFE21092
      gpg: Good signature from "Ubuntu CD Image Automatic Signing Key (2012) <cdimage at ubuntu.com>" [unknown]
      gpg: WARNING: This key is not certified with a trusted signature!
      gpg:          There is no indication that the signature belongs to the owner.
      Primary key fingerprint: 8439 38DF 228D 22F7 B374  2BC0 D94A A3F0 EFE2 1092
      
      
      The following validation might take a while
      sha256sum -c SHA256SUMS 2>&1 | grep OK     
      
      Press a key to finish 
      
      
      xubuntu-24.04.2-desktop-amd64.iso: OK

Regards,
Ralf