Failed to install rosdep tool: ERROR: cannot download default sources list from:

I am using nano pi k2 to install ros, during the installation process,

The following error message appears when installing the rosdep tool:

solution:

1. Open the hosts file

sudo nano /etc/hosts

2. Add a line (configure network) at the end of the file:

151.101.84.133 raw.githubusercontent.com

Then save and exit to continue.