This was not handled well at all.  I encountered exactly the problem
described in this bug report.  I took the latest updates and lost the
java plugin that my one critical app depended on.  Now I can no longer
run my critical app (Netilla) and am effectively dead in the water until
I can figure out the workaround by browsing around the net.  BTW,
openjdk may be the future of java, but it's not the present.  There are
many applications which fail with openjdk.

The right thing to do:
1) Warn the user, in a very in-your-face way, that you are about to downgrade 
your capabilities if you accept this update.
2) Explain specifically what the choices are.
3) Offer to install replacement packages (e.g. openjdk) if the downgrade path 
is taken.
4) Give the user an easy way to accept other updates but ignore this one, now 
and in the future.

If this had been done, it would have taken me no time at all to keep my
working machine and accept the risks involved with whatever security
issues are inherent in the previously working version of java.  Part of
the reason I use linux is that encounter maybe a couple orders of
magnitude less security problems out on the net than those using
windows.  Also, I don't visit those sites which are likely to cause
problems in the first place.  And additionally, I take advantage of
plugins like noscript which further limit my vulnerabilities.  It would
have been a no-brainer to keep my working setup as opposed to walking
into the mess I'm currently in.

And finally, it would be wonderful to have some kind of checkpoint
capability which would allow me to accept an update, try it, and if
necessary reject it and revert to my previous configuration.  This is
not the first time I have accepted an update only to find that it has
broken a working configuration, with no way that I can figure out to
back out of it.

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https://bugs.launchpad.net/bugs/906388

Title:
  updates should not remove software from computers without installing
  an equivalent replacement

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