bandersnatch报错No module Named的解决办法

ERROR: Unable to load entry point swift_plugin = bandersnatch_storage_plugins.swift:SwiftStorage: No module named ‘keystoneauth1’
这个办法时在安装时，因python版本原因缺少了，解决办法：
pip3 install keystoneauth1
Collecting keystoneauth1
Downloading https://files.pythonhosted.org/packages/7c/2e/dcfd2412941244e8a00a568654ce1687a1cab7be05d634ada0b5a078d0a3/keystoneauth1-4.4.0-py3-none-any.whl (314kB)
100% |████████████████████████████████| 317kB 240kB/s
Collecting pbr!=2.1.0,>=2.0.0 (from keystoneauth1)
Downloading https://files.pythonhosted.org/packages/73/c3/d45171501210b0305f4c93fafe50950f0c2228e87034ceb51744bd03ff08/pbr-5.8.0-py2.py3-none-any.whl (112kB)
100% |████████████████████████████████| 122kB 184kB/s
Requirement already satisfied: requests>=2.14.2 in /usr/lib/python3/dist-packages (from keystoneauth1)
Collecting stevedore>=1.20.0 (from keystoneauth1)
Downloading https://files.pythonhosted.org/packages/7a/bc/fcce9e50da73ea23af6d236e05e15db8a02da1099a5e0a479451bcea3833/stevedore-3.5.0-py3-none-any.whl (49kB)
100% |████████████████████████████████| 51kB 166kB/s
Requirement already satisfied: six>=1.10.0 in /usr/lib/python3/dist-packages (from keystoneauth1)
Collecting iso8601>=0.1.11 (from keystoneauth1)
Downloading https://files.pythonhosted.org/packages/df/e5/589bc81d410139ec4e4f37d9af5a50987566abf6d087b3c4fbed708109a9/iso8601-1.0.2-py3-none-any.whl
Collecting os-service-types>=1.2.0 (from keystoneauth1)
Downloading https://files.pythonhosted.org/packages/10/2d/318b2b631f68e0fc221ba8f45d163bf810cdb795cf242fe85ad3e5d45639/os_service_types-1.7.0-py2.py3-none-any.whl
Collecting importlib-metadata>=1.7.0; python_version < “3.8” (from stevedore>=1.20.0->keystoneauth1)
Downloading https://files.pythonhosted.org/packages/c4/1f/e2238896149df09953efcc53bdcc7d23597d6c53e428c30e572eda5ec6eb/importlib_metadata-4.8.2-py3-none-any.whl
Collecting zipp>=0.5 (from importlib-metadata>=1.7.0; python_version < “3.8”->stevedore>=1.20.0->keystoneauth1)
Using cached https://files.pythonhosted.org/packages/bd/df/d4a4974a3e3957fd1c1fa3082366d7fff6e428ddb55f074bf64876f8e8ad/zipp-3.6.0-py3-none-any.whl
Requirement already satisfied: typing-extensions>=3.6.4; python_version < “3.8” in /usr/local/lib/python3.7/dist-packages (from importlib-metadata>=1.7.0; python_version < “3.8”->stevedore>=1.20.0->keystoneauth1)
Installing collected packages: pbr, zipp, importlib-metadata, stevedore, iso8601, os-service-types, keystoneauth1
Successfully installed importlib-metadata-4.8.2 iso8601-1.0.2 keystoneauth1-4.4.0 os-service-types-1.7.0 pbr-5.8.0 stevedore-3.5.0 zipp-3.6.0

ERROR: Unable to load entry point swift_plugin = bandersnatch_storage_plugins.swift:SwiftStorage: No module named ‘swiftclient’
这个时安装时，缺少了python-swiftclient。
解决办法：
pip3 install python-swiftclient
Collecting python-swiftclient
Downloading https://files.pythonhosted.org/packages/f6/5f/6784a830e618a89272f8efee784930e614be285a6d3e82986916076fe69e/python_swiftclient-3.13.0-py2.py3-none-any.whl (86kB)
100% |████████████████████████████████| 92kB 281kB/s
Requirement already satisfied: six>=1.9.0 in /usr/lib/python3/dist-packages (from python-swiftclient)
Requirement already satisfied: requests>=1.1.0 in /usr/lib/python3/dist-packages (from python-swiftclient)
Installing collected packages: python-swiftclient
Successfully installed python-swiftclient-3.13.0

ModuleNotFoundError: No module named ‘apt_pkg’
这个报错通常是安装新版本的python后出现，完整报错信息如下：

mirror@mirror:~$ sudo apt-get update
Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu bionic InRelease
Hit:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit:5 http://archive.ubuntu.com/ubuntu bionic-security InRelease
Traceback (most recent call last):
File “/usr/lib/cnf-update-db”, line 8, in
from CommandNotFound.db.creator import DbCreator
File “/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py”, line 11, in
import apt_pkg
ModuleNotFoundError: No module named ‘apt_pkg’
Reading package lists… Done
E: Problem executing scripts APT::Update::Post-Invoke-Success ‘if /usr/bin/test -w /var/lib/command-not-found/ -a -e /usr/lib/cnf-update-db; then /usr/lib/cnf-update-db > /dev/null; fi’
E: Sub-process returned an error code

依照网上的一些方法尝试解决，依照没有成功，因为我的ubuntu原本是python3.6，安装了python3.7版本，最后的绝招是：

 update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.7 1

update-alternatives --config python3

apt-get remove --purge python3.6

apt-get install python3.7

最后再执行apt-get update，没有再报错。
mirror@mirror:~$ apt-get update
Reading package lists… Done
E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied)
E: Unable to lock directory /var/lib/apt/lists/
W: Problem unlinking the file /var/cache/apt/pkgcache.bin - RemoveCaches (13: Permission denied)
W: Problem unlinking the file /var/cache/apt/srcpkgcache.bin - RemoveCaches (13: Permission denied)
mirror@mirror:~$ sudo apt-get update
[sudo] password for mirror:
Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu bionic InRelease
Hit:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit:5 http://archive.ubuntu.com/ubuntu bionic-security InRelease
Reading package lists… Done

以上方法仅供参考，还是要找到适合自己环境的解决方法。

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