** Description changed:

  Very similar to bug 1003971.
  
  /etc/default/dhcp3-relay became /etc/default/isc-dhcp-relay with the 4.x 
release of isc.
  This file is generated by the maintainer script using debconf keys, so we 
can't apply the same trick as dhcp3-server.
  
  The implemented solution is to:
  1) Change dhcp3-server.config in Precise to source /etc/default/dhcp3-relay 
if present and load the values into debconf
  2) Have the postinst generate /etc/default/isc-dhcp-relay from debconf 
(showing the previous values to the user)
  3) Have the dhcp3-relay postinst remove any remaining /etc/default/dhcp3-relay
  
- Testcase:
+ ----
+ 
+ [rational]
+ Config file isn't migrated, leading to duplicate configuration files and lost 
settings.
+ 
+ [test case]
  1) Install dhcp3-relay on Ubuntu 10.04
  2) Use 1.2.3.4 as the server address and eth0 as the interface
  3) (ugly trick) manually update /etc/apt/sources.list to point to precise and 
include precise-proposed
  4) sudo apt-get update
  5) sudo apt-get install dhcp3-relay (a full dist-upgrade won't work, but 
selective upgrade of just dhcp3-server will work)
  6) Confirm that debconf is preseeded with the values from the old dhcp3-relay 
installation and that the resulting generated file in 
/etc/default/isc-dhcp-relay matches the one from dhcp3-relay. Also ensure that 
there's no more /etc/default/dhcp3* entries.
+ 
+ [regression potential]
+ If the previous configuration was broken, the new one will be broken too, but 
that's really what you'd expect from an upgrade...

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https://bugs.launchpad.net/bugs/1005547

Title:
  on upgrade lucid -> precise /etc/default/isc-dhcp-relay is not
  migrated

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