Python 在Ubuntu 16.04（LTS）中执行sudo apt get升级时出错

我已使用此命令升级“sudo apt get upgrade”，并收到以下错误。我是Linux新手。。。 任何帮助都将不胜感激

这是终端的输出 $sudo可升级

 Reading package lists... Done
 Building dependency tree       
 Reading state information... Done
 Calculating upgrade... Done
 The following packages will be upgraded: apport
 1 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
 34 not fully installed or removed.
 Need to get 0 B/120 kB of archives.
 After this operation, 0 B of additional disk space will be used.
 Do you want to continue? [Y/n] y
 (Reading database ... 565317 files and directories currently 
 installed.)
 Preparing to unpack .../apport_2.20.1-0ubuntu2.12_all.deb ...
 Traceback (most recent call last):
 File "/usr/bin/pyclean", line 24, in <module>
 import logging
 File "/usr/lib/python2.7/logging/__init__.py", line 26, in <module>
 import sys, os, time, cStringIO, traceback, warnings, weakref, 
 collections
 File "/usr/lib/python2.7/collections.py", line 9, in <module>
 from operator import itemgetter as _itemgetter, eq as _eq
 ImportError: /usr/lib/python2.7/lib-dynload/operator.so: undefined s 
 symbol: _PyUnicodeUCS4_AsDefaultEncodedString
 dpkg: warning: subprocess old pre-removal script returned error exit 
 status 1
 dpkg: trying script from the new package instead ...
 Traceback (most recent call last):
 File "/usr/bin/pyclean", line 24, in <module>
 import logging
 File "/usr/lib/python2.7/logging/__init__.py", line 26, in <module>
 import sys, os, time, cStringIO, traceback, warnings, weakref, 
 collections
 File "/usr/lib/python2.7/collections.py", line 9, in <module>
 from operator import itemgetter as _itemgetter, eq as _eq
 ImportError: /usr/lib/python2.7/lib-dynload/operator.so: undefined 
 symbol: _PyUnicodeUCS4_AsDefaultEncodedString
 dpkg: error processing archive /var/cache/apt/archives/apport_2.20.1-
 0ubuntu2.12_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
 Traceback (most recent call last):
 File "/usr/bin/pycompile", line 26, in <module>
 import logging
 File "/usr/lib/python2.7/logging/__init__.py", line 26, in <module>
 import sys, os, time, cStringIO, traceback, warnings, weakref, 
 collections
 File "/usr/lib/python2.7/collections.py", line 9, in <module>
 from operator import itemgetter as _itemgetter, eq as _eq
 ImportError: /usr/lib/python2.7/lib-dynload/operator.so: undefined   
 symbol: _PyUnicodeUCS4_AsDefaultEncodedString
 dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit 
 status 1
 Errors were encountered while processing:
 /var/cache/apt/archives/apport_2.20.1-0ubuntu2.12_all.deb
 E: Sub-process /usr/bin/dpkg returned an error code (1)

   W: The repository 'http://ppa.launchpad.net/fkrull/deadsnakes -
   python2.7/ubuntu xenial Release' does not have a Release file.
   N: Data from such a repository can't be authenticated and is 
   therefore potentially dangerous to use.
   N: See apt-secure(8) manpage for repository creation and user 
   configuration details.
   E: Failed to fetch http://ppa.launchpad.net/fkrull/deadsnakes  -
   python2.7/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not 
   Found
   E: Some index files failed to download. They have been ignored, or 
   old ones used instead.

---

您是否尝试过“更新”或“升级”

如果没有，请尝试

sudo-apt-get-update

然后

sudo-apt-get-upgrade

---

这将在升级前更新可用软件包列表。

非常感谢您的回复。我在升级前更新时收到此错误。N：来自此类存储库的数据无法进行身份验证，因此使用可能存在危险。N：有关存储库创建和用户配置的详细信息，请参阅apt secure（8）手册页。E:未能获取404未找到E:某些索引文件未能下载。它们已被忽略，或者使用了旧的。@IshuChandrakumar:Error明确表示请求的包不可用！！！。您应该尝试显式安装它们。是的，我仍然坚持我的答案，“sudo-apt-get-update”然后“sudo-apt-get-upgrade”才是正确的选择！