After encountering this problem, we refer to no less than ten online tutorials, none of which is effective, including but not limited to:
1. Hang up VPN (it seems that many people finally rely on science to get online, but I still can’t hang it here
2. Modify the upper limit of time parameter: useless, the system has the default maximum value, about one minute, to treat the symptoms but not the root cause
3. Modify the host file: all kinds of addresses of Google and GitHub have been added in, which is useless
4. Hang hot spot: same as 1, useless
For the final solution, please refer to Baidu Post Bar:
sudo apt-get update
sudo apt-get install python-rosdep
In the second step, there is an error message when installing Python rosdep. It seems that some files were not successfully installed, but in the end, rosdep update succeeded.
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