I have tested this on my Disco development machine, and here's what I found.
Using an iPhone SE running IOS 12.1.2. Connected the phone using a real cable (using my third party cable only allowed me to charge). Without doing anything further I open Nautilus and browsed to the phone, and indeed I did see the error described... "unhandled lock down". However, on the phone itself I was being asked if I wanted to "Trust this computer". I said "Trust this computer" and was then asked to enter my PIN. Once I had done this I was able to browse the photos as expected. Could people reporting this problem please check that the iDevice has been told to trust the computer and comment here? -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libimobiledevice in Ubuntu. https://bugs.launchpad.net/bugs/1799913 Title: Unhandled lockdown error (-2) - iphone ios 12 Status in libimobiledevice package in Ubuntu: Incomplete Bug description: Hi! On Ubuntu 18.10 when I connect my iPhone 8Plus with the computer and click on the Documents in the file manager, I got this error: Unhandled lockdown error (-2). I attached a screenshot about this error. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libimobiledevice/+bug/1799913/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp