Public bug reported:

Ubuntu 16.04

Using sudo apt-get update with the package repository set to
http://mirror.switch.ch I get the following result:

sudo apt-get update

Get:1 http://mirror.switch.ch/ftp/mirror/ubuntu xenial InRelease [247 kB]
Get:2 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates InRelease [92,2 
kB]
Hit:3 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-backports InRelease
Get:4 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security InRelease [92,2 
kB]
Get:5 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/main amd64 Packages [1 
201 kB]
Get:6 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/main i386 Packages [1 
196 kB]
Get:7 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/main Translation-en [568 
kB]
Get:8 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/main amd64 DEP-11 
Metadata                                           
Ign:8 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/main amd64 DEP-11 
Metadata                                           
Get:9 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/main DEP-11 64x64 Icons  
                                            
Ign:9 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/main DEP-11 64x64 Icons  
                                            
Get:10 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/restricted amd64 
Packages [8 344 B]                                 
Get:11 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/restricted i386 
Packages [8 684 B]                                  
Get:12 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/restricted 
Translation-en [2 908 B]                                 
Get:13 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/restricted amd64 DEP-11 
Metadata                                    
Err:13 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/restricted amd64 DEP-11 
Metadata                                    
  Hash Sum mismatch
Get:14 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe amd64 Packages 
[7 532 kB]                                  
Get:15 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe i386 Packages 
[7 512 kB]                                   
Get:16 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe Translation-en 
[4 354 kB]                                  
Get:17 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe amd64 DEP-11 
Metadata                                      
Ign:17 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe amd64 DEP-11 
Metadata                                      
Get:18 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe DEP-11 64x64 
Icons                                         
Ign:18 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe DEP-11 64x64 
Icons                                         
Get:19 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse amd64 
Packages [144 kB]                                  
Get:20 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse i386 
Packages [140 kB]                                   
Get:21 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse 
Translation-en [106 kB]                                  
Get:22 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse amd64 DEP-11 
Metadata                                    
Ign:22 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse amd64 DEP-11 
Metadata                                    
Get:23 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse DEP-11 64x64 
Icons                                       
Ign:23 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse DEP-11 64x64 
Icons                                       
Get:24 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/main amd64 
Packages [5 400 B]                               
Get:25 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/main i386 
Packages [5 404 B]                                
Get:26 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/main 
Translation-en [2 828 B]                               
Get:27 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/main amd64 
DEP-11 Metadata                                  
Err:27 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/main amd64 
DEP-11 Metadata                                  
  Hash Sum mismatch
Get:28 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/restricted 
amd64 Packages [64 B]                            
Get:29 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/restricted i386 
Packages [64 B]                             
Get:30 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/restricted 
Translation-en [64 B]                            
Get:31 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/restricted 
amd64 DEP-11 Metadata                            
Err:31 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/restricted 
amd64 DEP-11 Metadata                            
  Hash Sum mismatch
Get:32 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/universe amd64 
Packages [3 796 B]                           
Get:33 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/universe i386 
Packages [3 792 B]                            
Get:34 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/universe 
Translation-en [2 788 B]                           
Get:35 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/universe amd64 
DEP-11 Metadata                              
Err:35 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/universe amd64 
DEP-11 Metadata                              
  Hash Sum mismatch
Get:36 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/multiverse 
amd64 Packages [64 B]                            
Get:37 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-updates/multiverse i386 
Packages [64 B]                             
Get:38 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/main amd64 
Packages [2 920 B]                              
Get:39 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/main i386 
Packages [2 924 B]                               
Get:40 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/main 
Translation-en [1 288 B]                              
Get:41 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/main amd64 
DEP-11 Metadata                                 
Err:41 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/main amd64 
DEP-11 Metadata                                 
  Hash Sum mismatch
Get:42 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/restricted 
amd64 Packages [64 B]                           
Get:43 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/restricted 
i386 Packages [64 B]                            
Get:44 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/restricted 
Translation-en [64 B]                           
Get:45 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/restricted 
amd64 DEP-11 Metadata                           
Err:45 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/restricted 
amd64 DEP-11 Metadata                           
  Hash Sum mismatch
Get:46 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/universe amd64 
Packages [1 584 B]                          
Get:47 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/universe i386 
Packages [1 588 B]                           
Get:48 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/universe 
Translation-en [1 080 B]                          
Get:49 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/universe amd64 
DEP-11 Metadata                             
Err:49 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/universe amd64 
DEP-11 Metadata                             
  Hash Sum mismatch
Get:50 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/multiverse 
amd64 Packages [64 B]                           
Get:51 http://mirror.switch.ch/ftp/mirror/ubuntu xenial-security/multiverse 
i386 Packages [64 B]                            
Get:17 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe amd64 DEP-11 
Metadata [3 410 kB]                           
Get:18 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/universe DEP-11 64x64 
Icons [7 448 kB]                              
Get:22 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse amd64 DEP-11 
Metadata [63,8 kB]                          
Get:23 http://mirror.switch.ch/ftp/mirror/ubuntu xenial/multiverse DEP-11 64x64 
Icons [230 kB]                              
Fetched 34,4 MB in 26s (1 305 kB/s)                                             
                                            
Reading package lists... Done
E: Failed to fetch 
http://mirror.switch.ch/ftp/mirror/ubuntu/dists/xenial/restricted/dep11/by-hash/SHA256/e6280b1457cd2baf1519577450df82cb488971b8d3d65e6affd941343eae483f
  Hash Sum mismatch
E: Failed to fetch 
http://mirror.switch.ch/ftp/mirror/ubuntu/dists/xenial-updates/main/dep11/by-hash/SHA256/e2808f0646fce032b5a39adc6815a657fe8d32b227041258fcba9086a9a53c51
  Hash Sum mismatch
E: Failed to fetch 
http://mirror.switch.ch/ftp/mirror/ubuntu/dists/xenial-updates/restricted/dep11/by-hash/SHA256/06be49103dedd5df16d0b7f1f7599aa9150124ee31b9ba9497cde43ab50e0da4
  Hash Sum mismatch
E: Failed to fetch 
http://mirror.switch.ch/ftp/mirror/ubuntu/dists/xenial-updates/universe/dep11/by-hash/SHA256/e3b417ae507ab9e7d5f3cdf52a4399d144be0da74f8718e471e01eb07edc2470
  Hash Sum mismatch
E: Failed to fetch 
http://mirror.switch.ch/ftp/mirror/ubuntu/dists/xenial-security/main/dep11/by-hash/SHA256/b93efd725788884544e29b7af1d3db6d922307d451f2772cadcd15899c3a3b72
  Hash Sum mismatch
E: Failed to fetch 
http://mirror.switch.ch/ftp/mirror/ubuntu/dists/xenial-security/restricted/dep11/by-hash/SHA256/c9c5ddb7f20298793e1d4a21d705ebabc034f7f7f714b63b1dd9100529f94f65
  Hash Sum mismatch
E: Failed to fetch 
http://mirror.switch.ch/ftp/mirror/ubuntu/dists/xenial-security/universe/dep11/by-hash/SHA256/28a656035346cf9cefeefc5e9c957e18358caffaee0e8f442983e82e9aaddb23
  Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones 
used instead.

This command was executed right after a clean install using the DVD.

When using the main repository server everything run smoothly.

I expect that the result from the mirror is the same that using the main repos.
Instead I got what I described.

Is it well synchronized?

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1574987

Title:
  Hash Sum mismatch when apt-get from mirror.switch.ch

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