[Bug 1850672] [NEW] "precise esm -> trusty -> trusty new client" upgrade disables ESM

[Andreas Hasenack]

Public bug reported:

When enabling ESM on precise, then upgrading that to current trusty, and
from there to the proposed new trusty client (see #1832757), ESM gets
disabled.

Upstream bug: https://github.com/CanonicalLtd/ubuntu-advantage-
client/issues/899

The reason is that d/postinst, when dealing with this upgrade path, was
conditioning a file rename on the package upgrade coming from version 1,
which is the precise one. The fix is to drop that conditional, since the
filename we intend to rename is the precise one (it has "precise" in its
name) and there is no need to check for the version.

** Affects: ubuntu-advantage-script
     Importance: Unknown
         Status: Unknown

** Affects: ubuntu-advantage-tools (Ubuntu)
     Importance: High
     Assignee: Andreas Hasenack (ahasenack)
         Status: In Progress

** Changed in: ubuntu-advantage-tools (Ubuntu)
       Status: New => In Progress

** Bug watch added: github.com/CanonicalLtd/ubuntu-advantage-client/issues #899
   https://github.com/CanonicalLtd/ubuntu-advantage-client/issues/899

** Also affects: ubuntu-advantage-script via
   https://github.com/CanonicalLtd/ubuntu-advantage-client/issues/899
   Importance: Unknown
       Status: Unknown

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Title:
  "precise esm -> trusty -> trusty new client" upgrade disables ESM

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