Hi!
Aptd can do some things faster by handling the cache smarter and - because it 
does not try to be distro-agnostic - can rely on client tools accessing the Apt 
db directly, while PackageKit sends everything over a DBus connection.
We're working on making it possible for PackageKit to execute multiple actions 
at the same time (e.g. run GetDetails() while a InstallPackages() transaction 
is running), this resulted in rewriting large parts of the backend API.
For packages which require removal of other packages, Aptcc has mechanisms and 
that works really well at time. (introduced a loong time ago with the Simulate* 
methods) Downgrading packages is not yet possible, but planned. (we just 
haven't had a user who asked for this yet, so it has a lower priority ^^)
Aptcc is excellent at time, and it is one of the best-maintained backends PK 
has. Kudos to Daniel! Btw, I wonder where Sebastian Heinlein (glatzor) is to 
comment on this issue.... Nobody seems to have seen him for weeks...
Anyway, I filed the PK breakage as bug #1023953 , so PK installations should 
work fine again soon.
Regarding Xapian, let's see what we'll have soon. Writing the generator is on 
my todo-list, and if there are no other more important changes to do on the 
Software Center, I'll work on that soon. (And probably in Vala, not sure about 
the language yet) - right now, SQL is a viable solution too. (It's a pity 
AppStream progressed so slowly...)
If Ubuntu Quantal gets PackageKit 0.8.x (one PK from the 0.8 series), we'll 
have lots of great new features for everyone to test. But this step will need 
coordination with people at Ubuntu, otherwise it will break your compat-layer. 
(need to find someone responsible for making these decisions later, when 0.8.x 
is ready)

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https://bugs.launchpad.net/bugs/1021960

Title:
  python-aptdaemon.pkcompat cannot resolve some packages

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