Ubuntu – MD5 checksum not matching

14.04checksumsisomd5sumsystem-installation

I just downloaded ubuntu-14.04.1-desktop-amd64.iso from the official website and ran a MD5 checksum d2b966f36e76486ff4c83fb085557f97 which doesn't match any of the MD5 checksums listed at http://releases.ubuntu.com/14.04.1/MD5SUMS.

I checked the download link, it's http://ubuntu.excellmedia.net/releases/14.04.1/ubuntu-14.04.1-desktop-amd64.iso. Apparently Ubuntu's official website (which is where I initially went) chose the server for me because it's closest to me.

Is this a reliable server? Should I download from http://releases.ubuntu.com instead? Am I doing something wrong? Should I just download the file again?

Best Answer

I'd use the torrent to download the iso. The torrent clinet should do it's own verification too, and the iso should match the MD5 when it's done, and torrent's often faster.

http://www.ubuntu.com/download/alternative-downloads

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Ubuntu – MD5 mismatch on the 12.04 ISO, what is going on

So, firstly, sorry for the confusion here. Fundamentally it came down to a communication glitch between the release team and our sysadmins.

Around release time, we push many of our images out to Amazon's CloudFront service to keep our bandwidth use under control. releases.ubuntu.com is managed directly by the release team, but the images on CloudFront are pushed by our sysadmins, and we have to push there well in advance to make sure everything's in place. The sysadmins pushed the most recent daily build at the time, but after that we had to respin images for some serious bugs, and we forgot to let the sysadmins know about this so that they could update CloudFront. As a result, you were getting out-of-date versions.

We've pushed updated images to CloudFront now, and all should be well, although I'm going to check things over manually just to make sure.

Ubuntu – “The ./boot/grub/efi.img file failed the MD5 checksum verification.”

The OSX format conversion process is corrupting the file. Write it directly without converting it and everything will be fine.

#NUM=2  #Maybe - check which disk device is the right one 
dd if=ubuntu-12.04.3-server-amd64.img of=/dev/rdisk$NUM bs=1m

After you do that the check should complete correctly.

Don't proceed because, even if it happens to be safe this time round, next time round it might turn out that you downloaded a hacked or corrupted image and you won't be able to tell.

Best Answer

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Ubuntu – MD5 mismatch on the 12.04 ISO, what is going on

Ubuntu – “The ./boot/grub/efi.img file failed the MD5 checksum verification.”

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