Hello joey
here the result of the Apt.installed [ "dgit", "pypi2dsc" ]
apt installed dgit pypi2dsc ... ok
BUT
pypi2dsc does not exist (it is pypi2deb)
So there is something wrong with the installed property 
Cheers
Hello joey
here the result of the Apt.installed [ "dgit", "pypi2dsc" ]
apt installed dgit pypi2dsc ... ok
BUT
pypi2dsc does not exist (it is pypi2deb)
So there is something wrong with the installed property
Cheers
Implementation has:
So, if the packages are not isInstallable, nothing is done, and the property succeeds.
I think this check was intended to avoid running apt-get install unncessarily when the packages are already installed. However, isInstalled doesn't differentiate between a package being already installed and not available.
So, fixing.