[Bug 93304] Undoing a change which will break packages still does not permit us to apply changes

[Shriramana Sharma]

Public bug reported:

Binary package hint: adept

For example, I have mingw32 on a different repository and
mingw32-binutils and mingw32-runtime on a different repository. (local
repos) mingw32 depends on the other two. I disable the second repo and
there are no other repos providing them

1. I open adept and choose to install mingw32. It is marked as BREAK (install). 
2. I press "undo" from the toolbar.
3. I select an unrelated package, say "acl" for installation.
4. I press "Apply changes".
5. I get an error saying: dpkg run was refused. There was an error committing changes. Possibly there was some problem downloading packages or the commit would break packages.

Why do I get this error when I have said "undo" already? I am prevented
from installing even the unrelated "acl" package.

Note that after I get this error, acl is reset to "not installed - no
change". If I now try installing it, there is no problem. But why should
I get the problem in the first place?

** Affects: adept (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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Undoing a change which will break packages still does not permit us to apply changes
https://launchpad.net/bugs/93304