I can confirm such behavior. Just tried several combinations of partially and fully downloaded packages and I was able to see this effect on my machine (10.10 i386) in the following combination (although not sure if that is really the required situation to have it):
When starting update-manager it tells me that several updates are waiting to be downloaded and installed. I fully downloaded package A without installing it I started downloading for installation the package B and interrupted the download This creates A.deb in /var/cache/apt/archives and 'half' of B.deb in /var/cache/apt/archives/partial In update-manager selecting package A for installation leads to completing the download of B and installing both packages. see screen shot in attachment (A=wine1.2, B=ttf-droid) upgraded update-manager to 1:0.142.22 and see identical behavior. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/708576 Title: update manager installed an update without my permission -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs