Hi, I've tried fixing this by googling, and have tried the sudo apt update, sudo apt install packagekit fix issued by the elementary team. Appcenter works on my laptop, but is not working on the desktop. Appcenter is showing as version 0.2.4 Trying to update using a terminal gives these errors: Err:12 http://packages.elementary.io/appcenter xenial/main DEP-11 64x64 Icons Could not open file /var/lib/apt/lists/partial/packages.elementary.io_appcenter_dists_xenial_main_dep11_icons-64x64.tar.gz - open (13: Permission denied) [IP: 104.28.4.44 80] Get:10 http://packages.elementary.io/appcenter xenial/main amd64 Packages [136 kB] Fetched 311 kB in 1s (182 kB/s) Reading package lists... Done E: Failed to fetch http://packages.elementary.io/appcenter/dists/xenial/main/dep11/icons-64x64.tar Could not open file /var/lib/apt/lists/partial/packages.elementary.io_appcenter_dists_xenial_main_dep11_icons-64x64.tar.gz - open (13: Permission denied) [IP: 104.28.4.44 80] Does anyone have any suggestions how to troubleshoot this issue? Brendan