ERROR: Could not find a version that satisfies the requirement pbr>=2.0.0 (fr

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ERROR: Could not find a version that satisfies the requirement pbr>=2.0.0 (from versions: none)
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2 _2 ?1 u& X+ i一直报错
- q9 `6 H& @, G2 U8 Q- k, t解决办法
安装pbr
+ {' D/ P2 g( H  I! fpip install pbr
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