在 ubuntu 18.04 中安装 pgadmin4 时出错

如何解决在 ubuntu 18.04 中安装 pgadmin4 时出错

我正在尝试在 ubuntu 18.04 上安装 pgadmin，但出现以下错误。我也试过 rm 并重新安装，但它得到了同样的错误。

$ sudo apt-get install pgadmin4 pgadmin4-apache2
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    pgadmin4-apache2 is already the newest version (4.25-1.pgdg18.04+1).
    pgadmin4 is already the newest version (4.29).
    0 upgraded,0 newly installed,0 to remove and 13 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 pgadmin4-apache2 (4.25-1.pgdg18.04+1) ...
    apache2_invoke pgadmin4: already enabled
    Traceback (most recent call last):
      File "setup.py",line 18,in <module>
        from pgadmin.model import db,User,Version,ServerGroup,Server,\
      File "/usr/share/pgadmin4/web/pgadmin/__init__.py",line 19,in <module>
        from flask import Flask,abort,request,current_app,session,url_for
    ModuleNotFoundError: No module named 'flask'
    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)

我试过了，

sudo apt update --fix-missing
sudo apt install -f
sudo dpkg --configure -a

但它不起作用请任何人帮助我