在Ubuntu 18.04（仿生海狸）上安装时，大多数软件包我遇到一个错误，该错误涉及“ pgadmin4-apache2”，导致安装失败。是什么原因导致此错误，如果需要重新安装“ pgadmin4-apache2”，我该如何处理？
我尝试安装以下所有软件包，但均失败：
pip3 install python-mysql
sudo apt install mysql-client-core-5.7
sudo apt-get install python3.7-dev libmysqlclient-dev
我得到的错误如下：
Setting up pgadmin4-apache2 (4.5-1.pgdg18.04+1) ...
Traceback (most recent call last):
File "setup.py", line 17, in <module>
from pgadmin.model import db, User, Version, ServerGroup, Server, \
File "/usr/share/pgadmin4/web/pgadmin/__init__.py", line 38, in <module>
from pgadmin.setup import get_version, set_version
File "/usr/share/pgadmin4/web/pgadmin/setup/__init__.py", line 12, in <module>
from .db_upgrade import db_upgrade
File "/usr/share/pgadmin4/web/pgadmin/setup/db_upgrade.py", line 11, in <module>
import flask_migrate
File "/usr/lib/python3/dist-packages/flask_migrate/__init__.py", line 8, in <module>
from alembic import __version__ as __alembic_version__
File "/usr/lib/python3/dist-packages/alembic/__init__.py", line 9, in <module>
from . import context # noqa
File "/usr/lib/python3/dist-packages/alembic/context.py", line 1, in <module>
from .runtime.environment import EnvironmentContext
File "/usr/lib/python3/dist-packages/alembic/runtime/environment.py", line 2, in <module>
from .migration import MigrationContext
File "/usr/lib/python3/dist-packages/alembic/runtime/migration.py", line 12, in <module>
from .. import ddl, util
File "/usr/lib/python3/dist-packages/alembic/ddl/__init__.py", line 1, in <module>
from . import postgresql, mysql, sqlite, mssql, oracle # pragma: no cover
ImportError: cannot import name 'mysql'
dpkg: error processing package pgadmin4-apache2 (--configure):
installed pgadmin4-apache2 package post-installation script subprocess returned error exit status 1
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Setting up libpython3.7:amd64 (3.7.1-1~18.04) ...
Setting up libpython3.7-dev:amd64 (3.7.1-1~18.04) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Setting up zlib1g-dev:amd64 (1:1.2.11.dfsg-0ubuntu2) ...
Setting up libmysqlclient-dev (5.7.25-0ubuntu0.18.04.2) ...
Setting up python3.7-dev (3.7.1-1~18.04) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Errors were encountered while processing:
pgadmin4-apache2
我不太确定为什么每次也会同时安装“ pgadmin4-apache2”。
为了解决这个问题，我做了以下事情：
sudo apt-get purge pgadmin4-apache2
此操作无法完成，但是尽管失败，但我仍尝试重新安装“ pgadmin4-apache2”，但再次遇到错误。
sudo apt-get install pgadmin4-apache2
...
ImportError: cannot import name 'mysql'
dpkg: error processing package pgadmin4-apache2 (--configure):
installed pgadmin4-apache2 package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
pgadmin4-apache2
E: Sub-process /usr/bin/dpkg returned an error code (1)
此错误使我无法安装任何其他软件包。