Can't install: 192.168.1.18 port 22: Broken pipe

Hi, when trying to install the API the process starts OK but ends with 192.168.1.18 port 22: Broken pipe and the API is not installed. I would appreciate any hint on how to fix it. Many thanks in advance

 

Complete trace below

 

 

root@Yun3:~# pip install --target /mnt/sda1/python-packages dropbox
Collecting dropbox
/usr/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg/pip/_vendor/requests/packages/urllib3/util/ssl_.py:318: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#snimissingwarning.
  SNIMissingWarning
/usr/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading dropbox-8.0.0-py2-none-any.whl (392kB)
    100% |################################| 399kB 7.2kB/s 
Collecting six>=1.3.0 (from dropbox)
  Downloading six-1.10.0-py2.py3-none-any.whl
Collecting requests!=2.16.0,!=2.16.1,!=2.6.1,>=2.5.1 (from dropbox)
  Downloading requests-2.18.3-py2.py3-none-any.whl (88kB)
    100% |################################| 92kB 30kB/s 
Collecting urllib3 (from dropbox)
  Downloading urllib3-1.22-py2.py3-none-any.whl (132kB)
    100% |################################| 133kB 23kB/s 
Collecting idna<2.6,>=2.5 (from requests!=2.16.0,!=2.16.1,!=2.6.1,>=2.5.1->dropbox)
  Downloading idna-2.5-py2.py3-none-any.whl (55kB)
    100% |################################| 61kB 68kB/s 
Collecting certifi>=2017.4.17 (from requests!=2.16.0,!=2.16.1,!=2.6.1,>=2.5.1->dropbox)
  Downloading certifi-2017.7.27.1-py2.py3-none-any.whl (349kB)
    100% |################################| 358kB 7.1kB/s 
Collecting chardet<3.1.0,>=3.0.2 (from requests!=2.16.0,!=2.16.1,!=2.6.1,>=2.5.1->dropbox)
  Downloading chardet-3.0.4-py2.py3-none-any.whl (133kB)
    100% |################################| 143kB 12kB/s 
Installing collected packages: six, idna, certifi, urllib3, chardet, requests, dropbox
packet_write_wait: Connection to 192.168.1.18 port 22: Broken pipe