Version:           1.2.1 (using Devel) 
OS:                Linux

I have Google's Chrome PPA added to my system. The most recent update seems broken. When installing the update with apt-get the output is:

Get:1 http://dl.google.com/linux/chrome/deb/ stable/main google-chrome-stable amd64 16.0.912.75-r116452 [25.1 MB]
Fetched 7,783 kB in 0s (8,678 kB/s)  
Failed to fetch http://dl.google.com/linux/chrome/deb/pool/main/g/google-chrome-stable/google-chrome-stable_16.0.912.75-r116452_amd64.deb  Size mismatch

When attempting to perform this same update in muon-updater, no progress is made and the application gives no feedback as to what is happening (or that nothing happened)

Reproducible: Always

Steps to Reproduce:
1. Add Google Chrome PPA to software sources (or another with a package that is not the same size as reported by the updated package list).
2. Attempt to update this package using muon-updater


Actual Results:  
muon-updater asks for root password, then continues to try to install: it shows the download step briefly, then goes on to the installation step, where it goes no further

Expected Results:  
Obviously it can't fix problems with the underlying package management system, but it should at least warn the user that that system failed, or give some indication that a package couldn't be installed.

I've also tried removing the offending downloaded archive and retrying, as well as purging the PPA and adding it again, although these solutions would only be fixing the underlying problem, not the way muon-updater handles them.

KDE 4.7.97 from PPA:
http://ppa.launchpad.net/kubuntu-ppa/beta/ubuntu