无法重新安装plymouth-theme-ubuntu-logo，恢复Ubuntu默认启动徽标失败求助

各位前辈好，我是个Linux新手，之前尝试安装了kubuntu-desktop体验，后来把它卸载了，但启动界面却没变回Ubuntu默认的样式。

我运行sudo update-alternatives --config default.plymouth查看启动主题选项，结果只显示这些：

0            /usr/share/plymouth/themes/bgrt/bgrt.plymouth                     110  
auto mode
  
1            /usr/share/plymouth/themes/bgrt/bgrt.plymouth                     110       
manual mode
  
2            /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth       100       
manual mode

完全找不到ubuntu-logo相关的选项。

之后我试着用命令安装主题包，输入sudo apt install plymouth-theme-ubuntu-logo，结果系统提示这个包已经安装了，具体输出如下：

~$ sudo apt-get install plymouth-theme-ubuntu-logo
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distr...

有没有大佬能帮我解决这个问题，恢复Ubuntu的默认启动徽标呀？

备注：内容来源于stack exchange，提问作者Cameron Gilmour