Could not find suitable distribution for Requirement.parse('ecdsa>=0.11')

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error: Could not find suitable distribution for Requirement.parse('ecdsa>=0.11')
5 J) H+ ], Q* ^4 }, j# S( x$ s( d8 hInstalled /usr/lib/python2.7/site-packages/paramiko-1.15.2-py2.7.egg
- j, f( Y- R4 h; x( v6 YProcessing dependencies for paramiko==1.15.2
6 ~$ B6 D; F$ D4 h/ T* A. c# mSearching for ecdsa>=0.11
Reading https://pypi.python.org/simple/ecdsa/
Download error on https://pypi.python.org/simple/ecdsa/: [Errno -2] Name or service not known -- Some packages may not be found!
' T0 c9 R& U3 v$ pCouldn't find index page for 'ecdsa' (maybe misspelled?)
Scanning index of all packages (this may take a while)
* i, {# L$ s; p* {+ fReading https://pypi.python.org/simple/
Download error on https://pypi.python.org/simple/: [Errno -2] Name or service not known -- Some packages may not be found!
No local packages or download links found for ecdsa>=0.11
- ]& |0 s) h4 N+ ^; o7 nerror: Could not find suitable distribution for Requirement.parse('ecdsa>=0.11')

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