每当尝试在ubuntu中安装新软件包时如何解决梯形失真错误

Question

how to solve the keystone error whenever trying to install new package in ubuntu its getting error like

subprocess error
Reading package lists... Done
Building dependency tree
Reading state information... Done
nmap is already the newest version (7.01-2ubuntu2).
0 upgraded, 0 newly installed, 0 to remove and 256 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up keystone (2:9.3.0-0ubuntu3.2) ...
Traceback (most recent call last):
File "/usr/bin/keystone-manage", line 6, in
from keystone.cmd.manage import main
File "/usr/lib/python2.7/dist-packages/keystone/cmd/manage.py", line 32, in
from keystone.cmd import cli
File "/usr/lib/python2.7/dist-packages/keystone/cmd/cli.py", line 35, in
from keystone.federation import idp
File "/usr/lib/python2.7/dist-packages/keystone/federation/idp.py", line 23, in
from saml2 import client_base
File "/usr/lib/python2.7/dist-packages/saml2/client_base.py", line 13, in
from saml2.entity import Entity
File "/usr/lib/python2.7/dist-packages/saml2/entity.py", line 9, in
from saml2.metadata import ENDPOINTS
File "/usr/lib/python2.7/dist-packages/saml2/metadata.py", line 3, in
from saml2.sigver import security_context
File "/usr/lib/python2.7/dist-packages/saml2/sigver.py", line 8, in
from OpenSSL import crypto
ImportError: No module named OpenSSL
dpkg: error processing package keystone (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
keystone
E: Sub-process /usr/bin/dpkg returned an error code (1)

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Answer 1

install upgrade the pip and also upgrade the setuptools then after install the pyopenssl packege

   sudo pip install --upgrade pip
   sudo pip install --upgrade setuptools 
   sudo pip install pyopenssl