Error: could not find a version that satisfies the requirement xxxxx (from versions: none) solutions

Report errors ：

ERROR: Could not find a version that satisfies the requirement tensorboard==1.14.0 (from versions: none)
ERROR: No matching distribution found for tensorboard==1.14.0
WARNING: The repository located at pypi.tuna.tsinghua.edu.cn is not a trusted or secure host and is being ignored. If thi
s repository is available via HTTPS we recommend you use HTTPS instead, otherwise you may silence this warning and allow
it anyway with '--trusted-host pypi.tuna.tsinghua.edu.cn'.

---

Solution ：

pip install  Package name  -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com

for example ：

pip install tensorboard==1.14.0 -i http://pypi.douban.com/simple/
--trusted-host pypi.douban.com

Successful installation ~

Check it with the following command ~

conda list