rosdep init错误melodic

在执行sudo rosdep init时出现如下错误

ERROR: cannot download default sources list from:
https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list
Website may be down.

解决办法:
1.https://bugs.launchpad.net/ubuntu/+source/ca-certificates/+bug/1795242
2.Running sudo wget -O ruby-install-0.7.0.tar.gz https://github.com/postmodern/ruby-install/archive/v0.7.0.tar.gz

原文地址https://answers.ros.org/question/316260/rosdep-init-cannot-download-default-sources/?answer=316599#post-id-316599

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