Public bug reported:

I am getting checksum mismatches on trusty-updates since this morning.
It seems that the files were changed:

$ wget -O- -o /dev/null 
http://archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-amd64/ | sed 
-e 's/<[^>]*>/ /g'
 Index of /ubuntu/dists/trusty-updates/main/binary-amd64 
       Name    Last modified    Size        
      Parent Directory   &nbsp;    -   
      Packages.bz2   28-May-2015 10:23    513K  
      Packages.gz   28-May-2015 10:23    650K  
      Release   28-May-2015 10:23    104   

These are the expected MD5 hashes:

$ wget -o /dev/null -O- 
http://archive.ubuntu.com/ubuntu/dists/trusty-updates/Release | egrep 
main/binary-amd64/Packages.'(gz|bz2)' | head -2
 2684076da64123b17dd4370f381444a1           665944 main/binary-amd64/Packages.gz
 db2bb58fc4545ae77d0ad0850d3d07d0           525354 
main/binary-amd64/Packages.bz2

Packages.gz appears to be wrong:

$ wget -o /dev/null -O- 
http://archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-amd64/Packages.gz
 | md5sum
407e592770cac05d3e27e7ae4425f0aa  -

But Packages.bz2 is correct:

$ wget -o /dev/null -O- 
http://archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-amd64/Packages.bz2
 | md5sum
db2bb58fc4545ae77d0ad0850d3d07d0  -

Users may not be noticing because most of them are using bz2
compression, but MAAS fails on maas-import-pxe-files.

The difference appears to be in the Phased-Update-Percentage values:

@@ -74527,7 +74527,7 @@
 Description-md5: 739e58e2989afe568092890f45df8b83
 Bugs: https://bugs.launchpad.net/ubuntu/+filebug
 Origin: Ubuntu
-Phased-Update-Percentage: 10
+Phased-Update-Percentage: 30
 Supported: 5y
 Task: ubuntu-desktop, ubuntu-usb, edubuntu-desktop, edubuntu-usb
 
with the Bz2 file having 30% versus Gz having 10%, so this looks like an 
incomplete file update/regeneration.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1459618

Title:
  Incorrect package checksums for trusty-updates since this morning

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