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
0 o6 _% P2 N4 ~0 a8 _Searching 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!
6 I! Q' a! ]4 V& K& f# j: l0 z" cCouldn't find index page for 'ecdsa' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading https://pypi.python.org/simple/
# J) X+ F! N  @5 C$ P4 {9 QDownload error on https://pypi.python.org/simple/: [Errno -2] Name or service not known -- Some packages may not be found!
. P- g! y: E6 I5 M7 x- GNo local packages or download links found for ecdsa>=0.11
error: Could not find suitable distribution for Requirement.parse('ecdsa>=0.11')

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