That was a problem with LXD container. There is no such error anymore, so I believe this bug is fixed in recent Ubuntu versions.
** Bug watch added: LXD bug tracker #8490 https://github.com/lxc/lxd/issues/8490 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1349026 Title: regression: graphviz package does not configure plugins To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/graphviz/+bug/1349026/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
