[Bug 430197] Re: Disable partial upgrades during a development release

[Michael Terry]

I don't think so.  That commit handles a very specific case.  The new
package has to set all three of Provides, Conflicts, and Replaces.
Breaks isn't recognized, and I imagine that there are common churn
situations in a development release where Provides is not specified.

cjwatson, as the author of that patch, can you comment on the above?

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https://bugs.launchpad.net/bugs/430197

Title:
  Disable partial upgrades during a development release

Status in “update-manager” package in Ubuntu:
  Triaged

Bug description:
  More and more people test devel release of Ubuntu. While we give
  adequate warnings on the risks of running ubuntu+1 releases sometimes
  it's not enough.

  update-manager has a concept of a "partial upgrade" which seems to be
  more trouble than it's worth. Perhaps give the user a more descriptive
  set of options, something like:

  a) Wait until later until the archive works itself out.
  b) Install stuff, but don't remove anything
  c) Do a partial upgrade (and perhaps a scary warning like apt does when you try to remove glibc. "Yes, I recognize that I could explode my machine, do it."

  Or perhaps something like "Something bad has happened, go use apt-get"
  or something that makes it clear that update-manager is confused.

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