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')
Installed /usr/lib/python2.7/site-packages/paramiko-1.15.2-py2.7.egg
Processing dependencies for paramiko==1.15.2
) c! z4 J7 W5 K- q0 a$ C; @" zSearching 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!
( b8 _7 u; ]! U" m  w, p% l# n2 U6 UCouldn't find index page for 'ecdsa' (maybe misspelled?)
& S# A, S0 h% g8 K6 U; P# aScanning index of all packages (this may take a while)
6 T+ i: V7 m% u; a! t% w1 ~" TReading 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
* [' o. n+ q$ Y! D7 Xerror: Could not find suitable distribution for Requirement.parse('ecdsa>=0.11')

$ p! K6 N! O' f% y  j! n: s