While attempting to download the De Havilland DH 106 via the Flightgear 2017.2.1 activities tool I get
"An error occurred installing the aircraft de Havilland DH 106 Comet 4 (YASim): Invalid package checksum"
after it appeared to have been downloaded (all 4.0MB had appeared to have been downloaded). The aircraft however was not downloaded to the /org.flightgear.fgaddon/Aircraft/ file as per a properly functioning checksum program. The "DOWNLOAD" icon changed to "UPDATE" but was non-functional.
I next copied a DH 106 that I had downloaded via a zip file to the /org.flightgear.fgaddon/Aircraft/ file and then attempted to update via the 2017.2.1 Activities tool. I got the same "Invalid package checksum" and the copied file remains in the /org.flightgear.fgaddon/Aircraft/ file unchanged again as per a properly functioning checksum program. The "UPDATE" icon is now clickable but the "Invalid package checksum" is still all I get.
I doubt if any of this matters but -
My O.S. is the 64bit Linux Ubuntu 17.10
My computer is a Lenovo desktop with an Intel® Core™ Haswell i5-4570 CPU @ 3.20GHz × 4 and 15.6 GiB of memory.
Thank you,
Jim