** Description changed:

- Using Queens on Xenial.  We updated the packages to the current
- versions:
+ [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
+   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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https://bugs.launchpad.net/bugs/1802226

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

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