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')
: }" H4 {" q# e; ~Installed /usr/lib/python2.7/site-packages/paramiko-1.15.2-py2.7.egg
Processing dependencies for paramiko==1.15.2
Searching for ecdsa>=0.11
( T$ u" u0 ^, p- kReading 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!
3 z6 o0 z* k1 e3 R2 F+ V) S+ oCouldn't find index page for 'ecdsa' (maybe misspelled?)
Scanning index of all packages (this may take a while)
/ K. Q: s" _2 F6 `2 ?Reading https://pypi.python.org/simple/
2 ?9 n$ L3 }$ ~+ A0 \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
# b" H# h7 K: Rerror: Could not find suitable distribution for Requirement.parse('ecdsa>=0.11')
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