Hi there, trying to get Gnome Software Center going on a fresh install of Loki. This is the error I am getting: $ sudo apt install gnome-software Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: gnome-software : Depends: appstream but it is not going to be installed E: Unable to correct problems, you have held broken packages. Googled around a bit, found a potential solution, that didn't work. $ apt policy appstream appstream: Installed: 0.11.3-1~elementary0.4.1 Candidate: 0.11.3-1~elementary0.4.1 Version table: *** 0.11.3-1~elementary0.4.1 999 999 http://ppa.launchpad.net/elementary-os/os-patches/ubuntu xenial/main amd64 Packages 100 /var/lib/dpkg/status 0.10.6-1~ubuntu16.04.2 100 100 http://us.archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages 0.9.4-1ubuntu3 500 500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 0.9.4-1 500 500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages $ sudo apt install appstream=0.10.3-1~ubuntu16.04~ppa2 Reading package lists... Done Building dependency tree Reading state information... Done E: Version '0.10.3-1~ubuntu16.04~ppa2' for 'appstream' was not found I have no idea idea what to do now.