Installer crashed

[John Eskes]

I tried to install a Kubuntu 22.04 daily image (22 Mar '22) to my Dell Precision 5420 laptop.
Booting from USB went fine, but then the installer crashed with backtrace log:

Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 668, in <module>
    main(oem_config)
  File "/usr/lib/ubiquity/bin/ubiquity", line 652, in main
    install(args[0], query=options.query)
  File "/usr/lib/ubiquity/bin/ubiquity", line 268, in install
    wizard = ui.Wizard(distro)
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_ui.py", line 246, in __init__
    mod.ui = mod.ui_class(mod.controller)
  File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 214, in __init__
    self._setup_page()
  File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 220, in _setup_page
    self.nmwidget = nmwidgets.NetworkManagerWidget()
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/nmwidgets.py", line 367, in __init__
    self.view = NetworkManagerTreeView(self._on_state_changed)
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/nmwidgets.py", line 224, in __init__
    model = QtNetworkStore(self)
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/nmwidgets.py", line 110, in __init__
    self._init_icons()
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/nmwidgets.py", line 208, in _init_icons
    secure_pix = secure_icon.pixmap(ICON_SIZE / 2, ICON_SIZE / 2)
TypeError: arguments did not match any overloaded call:
  pixmap(self, QSize, mode: QIcon.Mode = QIcon.Normal, state: QIcon.State = QIcon.Off): argument 1 has unexpected type 'float'
  pixmap(self, int, int, mode: QIcon.Mode = QIcon.Normal, state: QIcon.State = QIcon.Off): argument 1 has unexpected type 'float'
  pixmap(self, int, mode: QIcon.Mode = QIcon.Normal, state: QIcon.State = QIcon.Off): argument 1 has unexpected type 'float'
  pixmap(self, QWindow, QSize, mode: QIcon.Mode = QIcon.Normal, state: QIcon.State = QIcon.Off): argument 1 has unexpected type 'float'

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubiquity 22.04.7
ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27
Uname: Linux 5.15.0-23-generic x86_64
ApportVersion: 2.20.11-0ubuntu79
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.467
CurrentDesktop: KDE
Date: Tue Mar 22 13:37:12 2022
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220322)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)