Install failure

[Gourav Rattihalli]

apt-get install libxext6
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  libxmuu1
Use 'apt autoremove' to remove it.
The following NEW packages will be installed:
  libxext6
0 upgraded, 1 newly installed, 0 to remove and 27 not upgraded.
Need to get 29.4 kB of archives.
After this operation, 125 kB of additional disk space will be used.
Err:1 http://xxx.xxx.xxx.xxx:80/data/040d470b23b0f368/archive.ubuntu.com/ubuntu xenial/main amd64 libxext6 amd64 2:1.3.3-1
  Unknown date format Bad header data
E: Failed to fetch http://xxx.xxx.xxx.xxx:80/data/040d470b23b0f368/archive.ubuntu.com/ubuntu/pool/main/libx/libxext/libxext6_1.3.3-1_amd64.deb Unknown date format Bad header data

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

[Juhani Numminen (jsonic)]

 This does not seem to be a problem in the libxext package. The error message indicates that apt-get failed to download the file from a mirror server "xxx.xxx.xxx.xxx". Please report the problem to the administrator of "xxx.xxx.xxx.xxx". You can try to use an official Ubuntu archive mirror to see if that solves the problem.