Hello Bernhard,I do indeed have a ~/.wget-hsts file, and it has permissions and contents that seem suspiciously linked with setup of unprivileged LXC containers. If I remove that file, wget seems to work fine. Obviously, wget shouldn't just be crashing when it fails to open this file, but at least you've given us a good work-around.
Thanks for finding the source of the problem. Kind regards, RW Penney