[Bug 1802226] Re: upgrade to 13.0.1-0ubuntu3~cloud0 caused loss of css

[Ubuntu Foundations Team Bug Bot]

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** Tags added: patch

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https://bugs.launchpad.net/bugs/1802226

Title:
  upgrade to 13.0.1-0ubuntu3~cloud0 caused loss of css

Status in horizon package in Ubuntu:
  New

Bug description:
  [Impact]
  After upgrading openstack-dashboard pkg,
  Because compressed css file name has been changed, 
  UI is broken

  affected B
  UCA Q

  keep testing the other releases and will update

  flushing or restarting memcached on openstack-dashboard fixes this
  issue.

  [Test Case]
  1. deploy openstack env
  2. install old pkg (e.g 13.0.1-0ubuntu1) on openstack-dashboard node
  3. apt install openstack-dashboard(this means upgrading)
  4. check web page

  [Regression]
  This patch flushes memcached's cache when installing pkg. It makes re-creating cache again so, it will be slow at first. Basically no effect to running cloud environment.

  [Others]


  [Original Description]
  Using Queens on Xenial.  We updated the packages to the current versions:

  ~$ apt-cache policy openstack-dashboard-ubuntu-theme
  openstack-dashboard-ubuntu-theme:
    Installed: 3:13.0.1-0ubuntu3~cloud0
    Candidate: 3:13.0.1-0ubuntu3~cloud0
    Version table:
   *** 3:13.0.1-0ubuntu3~cloud0 500
          500 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/queens/main amd64 Packages
          100 /var/lib/dpkg/status
       2:9.1.2-0ubuntu5 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
       2:9.0.0-0ubuntu2 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  Using the Ubuntu theme results in a page full of garbage, missing css.
  The browser reports the following in consoles:

  The requested URL /static/dashboard/css/6e9a9fafb1ba.css was not found
  on this server.

  If I use other themes, it seems OK, just this one.

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