The part where webpage should be rendered gets white for a fraction of second and then gets empty 
这是我的代码（基本上是https://www.pythonguis.com/examples/python-web-browser/ https://www.pythonguis.com/examples/python-web-browser/):
from PyQt5.QtCore import QUrl
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtWebEngineWidgets import *
import sys
class MainWindow(QMainWindow):
def __init__(self, *args, **kwargs):
super(MainWindow,self).__init__(*args, **kwargs)
self.browser = QWebEngineView()
self.browser.setUrl(QUrl("https://www.google.com"))
self.setCentralWidget(self.browser)
self.show()
app = QApplication(sys.argv)
window = MainWindow()
app.exec_()
这是类似的代码，我用它来从本地文件夹渲染 html（也不起作用 - 相同的症状）：
from PyQt5.QtCore import QUrl
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtWebEngineWidgets import *
import sys
class MainWindow(QMainWindow):
def __init__(self, *args, **kwargs):
super(MainWindow,self).__init__(*args, **kwargs)
self.browser = QWebEngineView()
file_path = os.path.abspath(os.path.join(os.path.dirname(__file__), 'temporary_files', "map.html"))
self.browser.load(QUrl.fromLocalFile(file_path))
self.setCentralWidget(self.browser)
self.show()
app = QApplication(sys.argv)
window = MainWindow()
app.exec_()
PyQt5.15.6、python3.8、操作系统 Ubuntu 22.04 LTS。之前在ubuntu 18.04上可以运行，重装系统后出现问题，尽管我备份并恢复了虚拟环境，所以库应该是相同的。
尝试这个：
from PyQt6.QtCore import QUrl
from PyQt6.QtWidgets import *
from PyQt6.QtGui import *
from PyQt6.QtWebEngineWidgets import *
import sys
class MainWindow(QMainWindow):
def __init__(self, *args, **kwargs):
super(MainWindow,self).__init__(*args, **kwargs)
self.browser = QWebEngineView()
self.setCentralWidget(self.browser)
# self.browser.setUrl(QUrl("https://www.google.com"))
self.browser.setHtml("<html><body><h1>Hello World... Hello World</h1></body></html>")
if __name__ == "__main__":
app = QApplication(sys.argv)
window = MainWindow()
window.show() # moved show outside main widget
sys.exit(app.exec()) # use app.exec instead of app.exec_
尝试使用 PyQt6 而不是 PyQt5。 Ubuntu 22.04 上的 Qt5-WebEngineWidgets 存在问题。