[Question Supplement]Error reported after switching to HKUST source:
It is probably a network problem. Try changing the source. It seems that yours is the Tsinghua source. Try using the HKUST source instead. HKUST source
The link has timed out. Connection timed out Unable to connect to aliyun.com． ． ． Please ping it.
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It is probably a network problem. Try changing the source. It seems that yours is the Tsinghua source. Try using the HKUST source instead. HKUST source
The link has timed out. Connection timed out Unable to connect to aliyun.com． ． ． Please ping it.