如何恢复默认的 Ubuntu 20.04 开机画面标志？

我在默认的 Ubuntu 20.04 上安装了 KDE 桌面。之后，我看不到带有戴尔徽标的默认 Ubuntu 徽标，这是 20.04 的新功能。而是看到 Kubuntu 徽标。

如何将其恢复到默认的 Ubuntu 启动屏幕？

我试过了

sudo update-alternatives --config default.plymouth 

我能够在手动模式下选择 ubuntu：

There are 6 choices for the alternative default.plymouth (providing /usr/share/plymouth/themes/default.plymouth).

  Selection    Path                                                                               Priority   Status
------------------------------------------------------------
  0            /usr/share/plymouth/themes/kubuntu-logo/kubuntu-logo.plymouth                       150       auto mode
  1            /usr/share/plymouth/themes/bgrt/bgrt.plymouth                                       110       manual mode
  2            /usr/share/plymouth/themes/kubuntu-logo/kubuntu-logo.plymouth                       150       manual mode
  3            /usr/share/plymouth/themes/spinner/spinner.plymouth                                 70        manual mode
  4            /usr/share/plymouth/themes/ubuntu-budgie-logo/ubuntu-budgie-logo-scale-2.plymouth   149       manual mode
  5            /usr/share/plymouth/themes/ubuntu-budgie-logo/ubuntu-budgie-logo.plymouth           150       manual mode
* 6            /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth                         100       manual mode

Press <enter> to keep the current choice[*], or type selection number: 
5

update-alternatives: using /usr/share/plymouth/themes/ubuntu-budgie-logo/ubuntu-budgie-logo.plymouth to provide /usr/share/plymouth/themes/default.plymouth (default.plymouth) in manual mode

——但这并没有帮助。如何使ubuntu进入自动模式？

有人可以帮忙吗？提前致谢！