bad MD5 sum on ubuntu.com

[tomhorsley]

I downloaded the alternate CD iso images, and the amd64 version fails the checksum (I tried all 3 md5, sha1, and sha256). The i386 version passes. The gpg signature on the checksum file verifies correctly, so it really looks like something is wrong with the amd64 iso image. (I tried re-downloading it, but got the same failure on the 2nd try as well).

[tomhorsley]

Here's the details of what I downloaded and what I see:

tomh> wget http://releases.ubuntu.com/12.04/ubuntu-12.04-alternate-amd64.iso
tomh> ls -l ubuntu-12.04-alternate-amd64.iso 
-rw-rw-r-- 1 tweety tweety 729067520 Apr 25 08:51 ubuntu-12.04-alternate-amd64.iso
tomh> sha256sum ubuntu-12.04-alternate-amd64.iso 
fd58d2e7e6a2b7e3bc795bfe77f5b8eb23b5a5a19b3d32b017b11cabf7e73d32  ubuntu-12.04-alternate-amd64.iso
tomh> fgrep ubuntu-12.04-alternate-amd64.iso SHA256SUMS
f8d54df0afbab6a6248f6e2bcab3e68f01c04d52b0bb1f889d880ad3bc881ccb *ubuntu-12.04-alternate-amd64.iso

[kolinab]

I'm experiencing the same - the desktop-i386 checksum looks right, but the amd64 build doesn't match.

I synced these files from a recent daily version with zsync, trying a torrent right now to see if I get a different result. Interesting.

K

[edit] Confirmed - I triple checked the checksums on ubuntu-12.04-desktop-i386.iso. All three match:

kolin@insp:~/Downloads$ md5sum ubuntu-12.04-desktop-i386.iso 
d791352694374f1c478779f7f4447a3f  ubuntu-12.04-desktop-i386.iso
kolin@insp:~/Downloads$ sha1sum ubuntu-12.04-desktop-i386.iso 
94ca138ab6375cf7a72eb62325182beb9c44a997  ubuntu-12.04-desktop-i386.iso
kolin@insp:~/Downloads$ sha256sum ubuntu-12.04-desktop-i386.iso 
dc76b5ef8b242e2f4f05a0ca2265a1d5e7ace12da5d39c817ec251e0b2461d6f  ubuntu-12.04-desktop-i386.iso

But no match on ubuntu-12.04-desktop-amd64.iso. This .iso was also 'finished' with zsync from a recent daily-live image:

kolin@insp:~/Downloads/doesn't md5$ md5sum ubuntu-12.04-desktop-amd64.iso 
57876b3740ee89e75c8fefc93a7ceee6  ubuntu-12.04-desktop-amd64.iso
kolin@insp:~/Downloads/doesn't md5$ sha1sum ubuntu-12.04-desktop-amd64.iso 
7a67974ca3fb92b39ea257fc463a76b85bc9be0e  ubuntu-12.04-desktop-amd64.iso
kolin@insp:~/Downloads/doesn't md5$ sha256sum ubuntu-12.04-desktop-amd64.iso 
2c32f3bbc7047a227d134d30cb2038b07c15a0a1bebbd253dbb7ead7dceaa21c  ubuntu-12.04-desktop-amd64.iso

I've just downloaded the amd64 build from .torrent and the checksums match this time:

kolin@insp:~/Downloads/ubuntu$ md5sum ubuntu-12.04-desktop-amd64.iso 
128f0c16f4734c420b0185a492d92e52  ubuntu-12.04-desktop-amd64.iso
kolin@insp:~/Downloads/ubuntu$ sha1sum ubuntu-12.04-desktop-amd64.iso 
cb1afefcd9fb01d8bc02e53de63e70a2f6a6e7de  ubuntu-12.04-desktop-amd64.iso
kolin@insp:~/Downloads/ubuntu$ sha256sum ubuntu-12.04-desktop-amd64.iso 
eca367bb12f7bf197cfb2ab4835ac073b9ed902a8c37c075c28dd6b9f0e4bb55  ubuntu-12.04-desktop-amd64.iso

So the zsync version doesn't match but the torrent version matches. Why?

[richud]

yeah failed for me too

MD5SUM file 9fcc322536575dda5879c279f0b142d7 *ubuntu-12.04-alternate-amd64.iso

MD5SUM of downloaded
$ md5sum ubuntu-12.04-alternate-amd64.iso
09cd432eec022881e9d5f58e6a32bab3 ubuntu-12.04-alternate-amd64.iso

[mineral4x]

The MD5 found in http://releases.ubuntu.com/precise/MD5SUMS does not match the actual MD5 of the iso found at http://releases.ubuntu.com/precise/u...ktop-amd64.iso

[kernelles]

Same problem here. What's going on? I've downloaded several times, both by torrent and directly, and used gisomount to calculate md5sum. Either I get the wrong sum, or a blank one.

[kolinab]

Wait, is this a matter of calculating a checksum on a 32 bit machine of a 64 bit image? Can't be . . . but that's my situation right now. . .

[richud]

just downloaded from different mirror (http://nl.releases.ubuntu.com/precise/) and its ok

$ md5sum "ubuntu-12.04-alternate-amd64 (1).iso"
9fcc322536575dda5879c279f0b142d7 ubuntu-12.04-alternate-amd64 (1).iso


using vbindiff between them - the (25th) release on releases.ubuntu.com/precise/ is in fact from 23rd and final (as far as MD5SUM says) is released on 25th

[Ub28]

I'm having exactly the same problem.

Can someone please verify the sha1sums and md5sums on the download page: http://releases.ubuntu.com/precise/

[kolinab]

Hi! We're seeing the same here:

See thread http://ubuntuforums.org/showthread.php?t=1965784